William Claiborne also, spelled Cleyburne (c. 1600 – c. 1677) was an English pioneer, surveyor, and an early settler in the colonies/provinces of Virginia and Maryland and around the Chesapeake Bay. Claiborne became a wealthy planter, a trader, and a major figure in the politics of the colonies. He was a central figure in the disputes between the colonists of Virginia and the later settling of Maryland, partly because of his earlier trading post on Kent Island in the mid-way of the Chesapeake Bay, which provoked the first naval military battles in North American waters. Claiborne repeatedly attempted and failed to regain Kent Island from the Maryland Calverts, sometimes by force of arms, after its inclusion in the lands that were granted by a 1632 Royal Charter to the Calvert family. Kent Island had become Maryland territory after the surrounding lands were granted to Sir George Calvert, first Baron and Lord Baltimore (1579-1632) by the reigning King of England, Charles I (1600–1649; reigned from 1625 until his execution in 1649).