 Harford inherited his father's estates in 1771, at the age of thirteen, but by 1776 events in America had overtaken his proprietary authority and he would soon lose all his wealth and power in the New World, though remaining wealthy thanks to his estates in England.Harford's father was Frederick Calvert, 6th Baron Baltimore, 4th (February 6, 1731 – September 4, 1771) and last in the line of Barons Baltimore.The Calvert family had been granted a royal charter to the Maryland colony in the 17th century.