Portland formally became a parish in 1723 by order of the Duke of Portland, the then-Governor of Jamaica after whom it is named. The existing port was to be called Port Antonio and was slated to become a naval stronghold. To that end, by 1729, the British began to build Fort George on the peninsula separating the twin East and West harbors known as the Titchfield promontory. The fort was intended to protect settlers from attacks by the Spanish from the sea, and from the Maroons (run-away slaves) who lived in the mountains.