In 1658 Mary Brent died, leaving her entire estate of 1000 acres (4 km2) to her sister. In 1663 Margaret Brent wrote her will. In 1670 she assigned one half of her 2,000 acres (8 km2) in Maryland to her nephew, James Clifton. Most of the remainder went to her brother Giles and his children. She died at "Peace", in the newly created Stafford County, Virginia in 1671. Her will was admitted into probate on May 19, 1671. In 1687, King James II granted 30,000 acres of land in Stafford County to her great-nephew George Brent (the only Catholic ever elected to the House of Burgesses) and three London residents and specifically allowed freedom of religion to the tract's residents.