 Initially, Accra was not the most prominent trading centre; the trade hubs of the time were the ports at Ada and Prampram, along with the inland centres of Dodowa and Akuse.The Dutch built the nearby outposts of Ussher Fort while the British and the Swedes built James Fort and Christiansborg castles, respectively.By the 17th century, Portugal, France and Denmark, had constructed forts in the city.