Cromwell Road is a major London road in the Royal Borough of Kensington and Chelsea, designated as part of the A4. It was created in the 19th century and is said to be named after Richard Cromwell, son of Oliver Cromwell, who once owned a house there. The Security Service (MI5) was based at 35 Cromwell Road from 1929 to 1934. 1.5 miles (2.4 km) long, it starts as West Cromwell Road, near West Kensington Underground station, and continues eastwards from Talgarth Road. It becomes Cromwell Road proper as it crosses Earl's Court Road.