In 1917, control of Aden Protectorate was transferred from the Government of India, which had inherited the British East India Company's interests in various princely states on the strategically important naval route from Europe to India, to the British Foreign Office. For administrative purposes, the protectorate was informally divided into the Eastern Protectorate (with its own Political Officer, a British advisor, stationed at Mukalla in Qu'aiti from 1937 to ca. 1967) and the Western Protectorate (with its own Political Officer, stationed at Lahej from 1 April 1937 to 1967), for some separation of administration.