Every cup of coffee in the world traces its roots to one place: the ancient highlands of Yemen. Here is the story of how a single plant changed civilization.

Coffee as we know it — Coffea arabica — did not emerge from human cultivation. Scientists have traced its origins to a spontaneous hybrid event in the wild forests of what is now western Ethiopia, near the Keffa Zone. Two wild species, Coffea canephora (Robusta) and a low-caffeine tree called Eugenioides, crossed naturally to produce Arabica — a botanical accident that would reshape the world.

"Likely well known locally and consumed for centuries prior to outside influence, the historical question of when coffee was first introduced to the rest of the world is still unsatisfactorily answered."

Local Ethiopian communities cultivated and consumed coffee for generations before any outside world knew it existed. It was only after it made the journey across the Red Sea to Yemen that coffee's global story truly began.

Yemen — then known as Arabia Felix — became coffee's first cultivated home. It was Sufi imams in the port city of Aden who first brought coffee into popular use, no later than the mid-15th century, drinking it during late-night religious vigils to stay alert.

From the famed port of Mokha (Moka), Yemen held a commercial monopoly on the world's entire coffee supply for nearly two centuries. Every cup drunk in the Ottoman Empire, Egypt, Persia, and eventually Europe, passed through Yemeni hands.

Yemen's monopoly could not last forever. Over centuries, through trade, theft, and colonial ambition, coffee spread across every continent.

• c. 1450 Yemen — The first cultivation: Sufi imams in Aden begin brewing coffee. The port of Mokha becomes the world's sole exporter of green coffee beans.

• 1616 Netherlands — The first theft: Dutch merchant Pieter van den Broecke smuggles a live coffee tree from Mokha to the Amsterdam Botanical Garden, breaking Yemen's monopoly.

• c. 1670 India — The monk's seeds: Indian Sufi monk Baba Budan smuggles seven coffee seeds from Yemen to the hills of Karnataka, planting the first coffee on the Indian subcontinent.

• 1699 Indonesia — Java is born: The Dutch bring Typica seedlings to Batavia (now Jakarta). After failed attempts, coffee thrives across the Indonesian islands — giving the world the word "java."

• 1715–27 Americas — Coffee crosses the Atlantic: From French and Dutch botanical gardens, coffee reaches Martinique, then Surinam, then Brazil — the country that would become the world's largest producer.

• 1880s+ Global dominance: Bourbon and Typica cultivars from Yemen's original stock spread through Latin America, East Africa, and Asia. By the 20th century, coffee is grown on six continents.