Fort Jesus, Mombasa

Timeline

1. 1589–1593Coral rock at the entrance to the old harbor of Mombasa Island · Mombasa IslandAfter Ottoman forces and Swahili city-states disrupted the Portuguese trade network in East Africa in the 1580s, Philip II, then ruling a united Iberian monarchy, ordered the fortification of Indian Ocean positions. Cairati, chief engineer of Portuguese India, selected a coral promontory on the southeast of Mombasa Island so that the batteries faced the old harbor channel, converting the existing Swahili port city into a fortified harbor able to withstand artillery.
2. 1593–1596Fort Jesus construction site · Mombasa IslandBetween 1593 and 1596, Portuguese engineers, Indian craftsmen, and Swahili laborers built an irregular pentagonal bastion fort of coral stone, its plan drawing on Renaissance ideas of human body proportions. Cairati supplied the site and design; on-site construction may have been supervised by Gaspar Rodrigues and others. On completion, the Portuguese held their first permanent fortress in East Africa able to withstand a siege by artillery.
3. 1596–1600Old town and old harbor of Mombasa · West coast of the Indian OceanAfter the fort's completion, the Portuguese garrison looked down on the old harbor, turning Mombasa from a relatively autonomous Swahili trading city into the East African keystone of the Portuguese Indian Ocean network. Whoever held Fort Jesus controlled the sea mouth leading to the island and the inland trade routes. By the turn of the sixteenth and seventeenth centuries it was the only large fortress the Portuguese continuously maintained on the Swahili Coast.