Sir Richard Grenville's great-grandson, Sir John Granville, helped restore Charles II to the throne, and in 1661 Charles made Sir John Granville Baron Granville of Bideford and Earl of Bath.
During the English Civil War Bideford stood with the Parliamentarians against the Royalist forces of Charles I.
The manor of Bideford was recorded in the Domesday Book of 1086 as held at some time in chief from William the Conqueror by the great Saxon nobleman Brictric, but later held by the king's wife Matilda of Flanders (c. in his youth Brictric declined the romantic advances of Matilda and his great fiefdom was thereupon seized by her.
Whatever the truth of the matter, years later when she was acting as Regent in England for William the Conqueror, she used her authority to confiscate Brictric's lands and threw him into prison, where he died.
After the revocation of the Edict of Nantes and the expulsion of French Protestants from France a considerable number of them immigrated to Bideford and they brought a lot of new trades to the town, including silk weaving.
Following fierce fighting around the two forts the town fell.
It was however certainly one of the constituent manors of the Honour of Gloucester granted by King William Rufus to Robert Fitz Hamon." Richard de Grenville is known to have held seven knight's fees from the Honour of Gloucester, either granted to him by his brother Fitz Hamon or the latter's son-in-law and heir Robert, 1st Earl of Gloucester (1100–1147).
Round supposes instead that the Grenvilles of Bideford and Stowe were descended from a certain "Robert de Grenville" (alias de Grainville, de Grainavilla, etc.) who was a junior witness to Richard's foundation charter of Neath Abbey, and who in the 1166 Cartae Baronum return was listed as holding one knight's fee from the Earl of Gloucester, feudal baron of Gloucester.
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.
He obtained from Fitz Hamon the lordship of Neath, Glamorgan, in which he built Neath Castle and in 1129 founded Neath Abbey.