A History of the Persian Gulf

• Introduction
• Chapter 1: The Drowned World: Prehistoric Life in the Gulf Oasis
• Chapter 2: Cradle of Maritime Trade: The Dilmun, Magan, and Meluhha Civilizations
• Chapter 3: The Great King's Sea: Persian Empires and the Control of Gulf Waters
• Chapter 4: The Rise of Islam: New Faith, New Ports, and the Golden Age of Seafaring
• Chapter 5: The Age of Siraf: The Gulf's Central Role in Global Trade Networks
• Chapter 6: The Frankish Arrival: The Portuguese Conquest of Hormuz and the Beginning of European Dominance
• Chapter 7: Companies and Commerce: The Dutch and British East India Companies Compete for Influence
• Chapter 8: Local Dynasties and Imperial Rivalries: The Ottomans and Safavids in the Gulf
• Chapter 9: The 'Pirate Coast': The Qawasim and the British Naval Campaigns
• Chapter 10: An Enduring Truce: The Making of the Trucial States
• Chapter 11: The Pearling Coast: A Centuries-Old Economy and Way of Life
• Chapter 12: The Age of the Political Resident: A Century of British Hegemony
• Chapter 13: The Search for Black Gold: Early Geological Surveys and the First Concessions
• Chapter 14: The Discovery of Oil: Transforming the Desert Sands
• Chapter 15: From Trucial States to United Arab Emirates: The British Withdrawal and the Birth of Nations
• Chapter 16: The Post-War Order: American Ascendancy and the 'Twin Pillars' Policy
• Chapter 17: Revolution in Iran: The Fall of the Shah and the Reshaping of Regional Power
• Chapter 18: The Longest War of the Century: The Iran-Iraq War
• Chapter 19: Operation Desert Storm: The Invasion of Kuwait and the First Gulf War
• Chapter 20: The 1990s: Dual Containment and the Shifting Sands of Alliances
• Chapter 21: The Rise of the Metropolis: Dubai, Doha, and the Race for Global City Status
• Chapter 22: A New Era of Intervention: The 2003 Invasion of Iraq and its Aftermath
• Chapter 23: The Arab Spring: Ripples and Responses in the Gulf Monarchies
• Chapter 24: Economic Visions and New Realities: Diversification Beyond Oil
• Chapter 25: A New Geopolitical Landscape: Navigating the Complexities of the 21st Century Gulf

The body of water that separates the Arabian Peninsula from the Iranian plateau is not large. At its widest, it is only some 370 kilometers across; at its narrowest point, the Strait of Hormuz, the navigable channel shrinks to just a few miles. Yet, for thousands of years, this relatively small sea has acted as one of history’s great arteries. It has been a conduit for trade, a cradle for civilizations, a crucible of faith, and a theater of imperial ambition. The history of this waterway—known to the ancient Greeks as Sinus Persicus and for millennia thereafter as the Persian Gulf—is in many ways a history of the world in miniature. It is a story of connection and conflict, of staggering wealth generated from the sea, first in the form of pearls and later in the seemingly limitless reserves of hydrocarbons beneath its floor, and of the profound transformations this wealth has wrought upon the societies along its shores.

This book traces that long and complex story, from a time when the Gulf as we know it did not even exist, to its current role as a pivot point in global energy and geopolitics. Our narrative begins in a drowned world, a time during the last Ice Age when lower sea levels exposed the basin as a fertile river valley, a potential refuge for early humans migrating out of Africa. When the ice caps melted and the sea rushed in, it created a unique maritime environment, a shallow, warm, and highly saline sea that would shape the destiny of all who lived on its coasts. From these shores emerged some of the world's earliest and most enduring civilizations.

Long before the rise of Greece or Rome, the peoples of the Gulf were masters of maritime trade. The Sumerians of Mesopotamia, one of the world's first urban civilizations, depended on the sea lanes of the Gulf for essential raw materials. Their cuneiform tablets speak of a thriving commerce with the distant lands of Dilmun, Magan, and Meluhha. Archaeologists now widely associate Dilmun with modern-day Bahrain and the adjacent Saudi coast, a prosperous trading hub that connected the copper mines of Magan (Oman) with the great cities of the Indus Valley (Meluhha). For millennia, the Gulf was a bustling highway, a vital link in a network that stretched from the Mediterranean to India and beyond.

Control of this vital waterway has been contested since antiquity. The Achaemenid Persian Empire, one of the largest the world had ever seen, understood its strategic value, as did the Sasanian dynasty that followed. The rise of Islam in the seventh century AD transformed the region, turning the Gulf into an Arab- and Persian-dominated lake that became central to the flourishing of a new global civilization. Ports like Siraf, on the Iranian coast, became cosmopolitan centers of commerce and learning, their merchants sailing as far as China, their wealth legendary.

The arrival of outsiders marked a dramatic turning point. In the early 16th century, the heavily armed fleets of the Portuguese, commanded by the formidable Afonso de Albuquerque, blasted their way into the Indian Ocean and seized the strategic island of Hormuz, which controlled the strait at the mouth of the Gulf. This act of violent intrusion shattered the old patterns of trade and inaugurated a new era of European involvement. The Portuguese were followed by the Dutch and the English, whose rival East India Companies vied for commercial and political dominance. For the next three centuries, the Gulf became an arena for European imperial competition, a struggle that would culminate in an era of undisputed British hegemony. By the 19th century, Great Britain had established a network of treaties with local Arab rulers, creating what would become known as the Trucial States and turning the Gulf into a de facto British lake, a frontier protecting the western flank of its Indian empire.

Throughout these long centuries of trade and turmoil, the rhythm of life for most of the Gulf's inhabitants was dictated not by the maneuverings of empires, but by the seasons of the pearl dive. For thousands of years, the world’s finest pearls were harvested from the shallow oyster beds of the Gulf. This perilous and all-consuming industry was the bedrock of the regional economy, a way of life that shaped the culture, society, and fortunes of coastal communities from Kuwait to the shores of modern-day Oman. The collapse of this ancient economy in the early 20th century, brought on by the combination of the Great Depression and the invention of the cultured pearl in Japan, seemed to portend a bleak future for the region.

But beneath the sands and the seabed lay a different kind of treasure. The discovery of oil—first in Persia in 1908 and then, in the 1930s, on the Arabian side of the Gulf—would trigger one of the most rapid and profound transformations in human history. The story of the latter half of the 20th century in the Gulf is one of almost unimaginable change, as the revenues from "black gold" turned small, impoverished sheikhdoms into some of the wealthiest nations on earth. This sudden influx of wealth funded the creation of modern states, with gleaming cities rising from the desert, but it also intensified geopolitical rivalries and drew the region deeper into the vortex of international power politics.

The name of this sea itself has become a point of contention. While historically and internationally recognized as the Persian Gulf, the rise of Pan-Arab nationalism in the 1960s saw many Arab nations advocate for the name "Arabian Gulf." This naming dispute is more than a semantic squabble; it reflects the deep-seated rivalries and competing historical narratives that define the modern Gulf, a region where ancient identities and modern nationalisms often collide.

From the British withdrawal in the early 1970s and the formation of the United Arab Emirates, through the Iranian Revolution, the devastating eight-year war between Iran and Iraq, the two Gulf Wars, and the rise of megacities like Dubai and Doha, the recent history of the Gulf has been anything but tranquil. It remains, as it has always been, a place of immense strategic importance, a vital artery for the global economy through which a significant portion of the world's oil supply must pass. Its history is a testament to the enduring power of geography to shape human destiny and a reminder that this small sea, tucked between deserts, will continue to play an outsized role in the story of our world.

To understand the very beginning of the human story in the Persian Gulf, one must first erase the sea. Imagine standing on the desolate, sun-scorched bluffs of the Zagros Mountains in what is now southern Iran and looking south, not upon a shimmering expanse of blue water, but across a vast, green river valley. Picture a landscape where the mighty Tigris and Euphrates rivers, instead of surrendering to the sea in southern Iraq, joined forces with other powerful rivers like Iran’s Karun and Arabia’s Wadi Batin. Together, they forged a single, immense waterway—a "super-river" some have called the Ur-Shatt—that flowed south for hundreds of miles through a wide, gentle floodplain before finally emptying into the Gulf of Oman. This was the Persian Gulf basin for most of the last 125,000 years: not a sea, but a sanctuary.

This vanished landscape, now often referred to as the "Gulf Oasis," was a direct consequence of the great ice ages. During the Last Glacial Maximum, which peaked around 20,000 years ago, colossal ice sheets locked up immense quantities of the world's water over North America and Eurasia. This planetary-scale deep freeze caused global sea levels to plummet by as much as 120 meters, or nearly 400 feet, below their present-day positions. The Persian Gulf, being a remarkably shallow body of water—its average depth today is only about 35 meters—was left high and dry. The basin, exposed to the air, became a well-watered, temperate, and exceptionally fertile valley, at times reaching the size of Great Britain.

It was a world teeming with life. While the surrounding highlands of Iran and the deserts of Arabia were often gripped by hyper-arid conditions, the Gulf Oasis would have been a lush refuge. We can envision herds of gazelles, onagers, and wild cattle grazing on extensive grasslands. The riverbanks, fringed with reed beds and groves of date palms, would have been home to abundant birdlife and smaller mammals. The great river itself, along with its tributaries and extensive marshlands, would have been a paradise for fish, turtles, and crocodiles. For Paleolithic hunter-gatherers, it would have been an environment of extraordinary abundance, a stark contrast to the harsh deserts that flanked it. The valley floor was not only nourished by the great rivers flowing from the north and east, but also by freshwater springs bubbling up from aquifers deep beneath the Arabian Peninsula—a phenomenon that persists today, with fishermen and pearl divers long knowing of spots on the seabed where they could collect fresh water.

This oasis was not merely a local haven; it may have played a pivotal role in the grand saga of human migration. The prevailing "Out of Africa" theory posits that Homo sapiens began to disperse from their ancestral homeland between 60,000 and 70,000 years ago, eventually colonizing the entire planet. For a long time, the exact routes of this great expansion were a matter of intense debate. Increasingly, however, evidence points to the Arabian Peninsula as a crucial corridor, and the Gulf Oasis as a key stopping point, or perhaps even a long-term homeland, on this journey.

Archaeological discoveries around the peripheries of the Gulf—which would have been the highlands overlooking the ancient valley—support this idea. In places like Jebel Faya in the United Arab Emirates, stone tools have been found that date back as far as 125,000 years, suggesting a human presence in the region far earlier than once thought. The existence of this well-watered valley provides a compelling explanation for how these early pioneers could have survived, and even thrived, after crossing into Arabia from Africa. The Gulf Oasis could have served as a demographic refuge, a sanctuary where populations could shelter and grow during the harshest millennia of the Ice Age, when the surrounding regions were uninhabitable. For tens of thousands of years, this valley may have been one of the primary centers of human population in Southwest Asia.

The people of the Gulf Oasis were likely small, mobile bands of hunter-gatherers. They would have moved through the landscape with the seasons, following the migrations of game animals and harvesting the wild plants, fruits, and nuts that the valley provided in abundance. They would have camped along the riverbanks and the shores of the freshwater lakes that dotted the floodplain. Their toolkits, made from chert and flint quarried from the surrounding hills, would have included spear points for hunting, scrapers for processing hides, and blades for a variety of cutting tasks. While the direct evidence of their lives—their campsites, their hearths, their discarded tools—now lies buried under hundreds of feet of water and thick layers of marine sediment, their legacy is written on the modern landscape. The people who would eventually build the world's first cities in Mesopotamia may well have had their deepest roots in this now-drowned world.

But this world was not to last. Beginning around 18,000 years ago, the Earth's climate began to warm, and the great ice sheets that had held the planet in their grip started to melt. For the inhabitants of the Gulf Oasis, this was a change of apocalyptic proportions, though it would have unfolded not in a single, cataclysmic day, but over the course of some ten thousand years. As meltwater poured into the world's oceans, sea levels began to rise. The Indian Ocean, which had been held at bay far to the south beyond the Strait of Hormuz, began its slow, inexorable advance into the valley.

The inundation was not a smooth or steady process. It likely occurred in phases, with periods of rapid sea-level rise followed by centuries of relative stability. The initial intrusion of seawater would have been dramatic. Around 14,000 years ago, the ocean breached the sill at the Strait of Hormuz and began to flood the lowest parts of the valley. The great freshwater river, the Ur-Shatt, was pushed steadily backward. What were once freshwater marshes and lagoons became saline estuaries. The advancing shoreline may have moved at a pace that was perceptible within a human lifetime, forcing communities to relocate their camps and hunting grounds ever northward and westward.

By about 8,000 years ago, the flooding was largely complete. The sea had reclaimed the entire basin, transforming the fertile valley back into the body of water we know today. The highlands that once overlooked a green oasis now formed the coastline of a new sea. The people who had called the valley home for millennia were displaced, forced to retreat to this newly created shoreline in modern-day Saudi Arabia, Qatar, the UAE, and Iran, or to move further up the river valleys into Mesopotamia.

This dramatic event seems to be vividly reflected in the archaeological record. Around 7,500 years ago, there is a sudden and striking proliferation of new settlements all around the shores of the Persian Gulf. Whereas the preceding millennia show only scattered and ephemeral hunting camps, archaeologists have now discovered more than 60 substantial Neolithic villages that appear "virtually overnight." These settlements are surprisingly sophisticated, boasting well-built stone houses, evidence of domesticated animals like cattle and sheep, deep-sea fishing, long-distance trade networks, and elaborately decorated pottery. It has even been suggested that some of the world's oldest known boats were developed by these new coastal communities.

Archaeologist Jeffrey Rose, a key proponent of the "Gulf Oasis" hypothesis, argues that this is no coincidence. He suggests that these new colonists were the descendants of the displaced populations from the drowned valley. Having lived for generations in a resource-rich oasis, they may have already begun to develop the skills and social structures that form the foundation of settled life. The trauma of being driven from their ancestral homeland by the rising waters may have been the catalyst that pushed them to innovate and build permanent communities in their new coastal environments. The sudden appearance of these villages, in other words, was not the start of a new story, but the continuation of a much older one whose earlier chapters are now underwater.

It is also difficult to ignore the powerful echoes of this great inundation in the mythology of the region. Millennia later, the civilizations that arose in Mesopotamia, on the very edge of the newly formed Gulf, would tell stories of a great, world-engulfing flood. The most famous of these is contained within the Epic of Gilgamesh, where the hero Utnapishtim is warned by the gods of a coming deluge and builds a great boat to save his family and all living creatures. While flood myths are common to many cultures around the world, the memory of a real and devastating flood that reshaped the very world of their ancestors may have been particularly potent for the peoples of southern Mesopotamia. The story of a lost paradise, a fertile land swallowed by the waves, may be more than just a myth; it could be a distant, deeply ingrained cultural memory of the drowned world of the Gulf Oasis.