Great Portland Street. In 1710 the manor of Marylebone was bought by the Duke of Newcastle, but by 1734 it passed to the Second Duke of Portland. When the street was built in the late 18th century it was so named in honour of the Duke, the northern part being known as Portland Road, which was recorded in 1793. The prefix Great does not indicate the impor¬tance of the street itself but that there are smaller streets of the same name in the neighbourhood.

The station was opened as PORTLAND ROAD on 10 January 1863 and re-named GREAT PORTLAND STREET 1 March 1917.