High Quality Content by WIKIPEDIA articles! Benedict Swingate Calvert (ca. 1730-1732 – January 9, 1788) was a Maryland Loyalist during the American Revolution. He was the son of Charles Calvert, 5th Baron Baltimore, the third Proprietor Governor of Maryland (1699–1751), and may have been the grandson of King George I of Great Britain. His mother`s identity is not known, though one source suggests Melusina von der Schulenburg, Countess of Walsingham. As he was illegitimate, he was not able to inherit his father`s title or estates, which passed instead to his half brother Frederick Calvert, 6th Baron Baltimore (1731–1771). Benedict Calvert spent most of his life as a politician and planter in Maryland, though Frederick, by contrast, never visited the colony. Calvert became wealthy through proprietarial patronage and became an important colonial official, but he would lose his offices and his political power, though not his land and wealth, during the American Revolution.