The fidelity with which Carteret, like John Berkeley, 1st Baron Berkeley of Stratton, had clung to the royal cause, gave him also great influence at court: he was close to Clarendon, and to the Earl of Sandwich, whose daughter married Carteret's eldest son. He had, at an early date, taken a warm interest in the colonization of America. In recognition of all the help given to him during his exile in Jersey in the 1640s, Charles II gave Carteret a large grant of land previously named New Netherland, which was promptly renamed New Jersey under his charge. With Berkeley, he became one of the proprietors of the Province of Carolina prior to their becoming jointly interested in East Jersey. Carteret County, North Carolina and town of Carteret, New Jersey are named after him, and the city of Elizabeth, New Jersey, is named after his wife, as is Elizabethtown, North Carolina.