Sir Bevil Grenville was an English landowner and soldier who sat as a Member of Parliament for various constituencies between 1620 and 1642, although during those years there were few parliamentary sessions. When the First English Civil War broke out in August 1642, he joined the Royalists and played a leading role in their early campaigns in the West Country. He was killed in action at the Battle of Lansdowne in 1643.

Sir Richard Grenville was a professional soldier from Cornwall, who served in the Thirty Years War, and 1638 to 1651 Wars of the Three Kingdoms. He was the younger brother of Sir Bevil Grenville, who died at Lansdowne in 1643, and grandson of Admiral Sir Richard, killed at Flores in 1591.