 Grenville was never elected as Mayor of Bideford, preferring instead to support John Salterne in that role, but he was Lord of the Manor, a title held by the Grenvilles since 1126 and finally ceded by his descendants in 1711 to the Town Council he established.On his return from Roanoke Colony Grenville's ship "Tiger" captured a Spanish galleon the "Santa Maria de San Vicente" off Bermuda in late August 1585.The Spanish prize was brought into Bideford with riches valued at around 15,000 pounds.