Aden is a governorate of Yemen, including the city of Aden. At the 2004 census, it had a population of 589,419. The ancient capital, the port city of Crater, was located here. Aden was under British rule in the period from 1839 to 1967. In 1967, after years of struggle, Aden and other southern their independence. The city of Aden became the capital of South Ye…Aden is a governorate of Yemen, including the city of Aden. At the 2004 census, it had a population of 589,419. The ancient capital, the port city of Crater, was located here. Aden was under British rule in the period from 1839 to 1967. In 1967, after years of struggle, Aden and other southern their independence. The city of Aden became the capital of South Yemen between 1967 and 1990. In 1990, both South Yemen and North Yemen combined to form the present Republic of Yemen. Aden is now the commercial capital of the Republic of Yemen.