born с 1606, England
died June 9, 1647, St. Mary's, Md.
First governor of the Maryland colony.
He was the younger brother of Cecil Calvert, the colony's proprietor. In 1633 he was sent from England to establish a settlement at St. Mary's. He gradually allowed limited legislative initiative in the colony's assembly. He lost a land conflict with William Claiborne and was forced to leave Maryland (1644–46); aided by colonists, including Margaret Brent , he returned to reinstate his proprietorial rule.