The siege of Lyme Regis was an eight-week blockade during the First English Civil War. The port of Lyme Regis, in Dorset, was considered to be of strategic importance because of its position along the main shipping route between Bristol and the English Channel. Thomas Ceeley and Robert Blake commanded the town's Parliamentarian defences during the siege, which was laid by Prince Maurice between 20 April and 16 June 1644.