The retroceded land was then known as Alexandria County, Virginia, and now includes a portion of the independent city of Alexandria and all of Arlington County, the successor to Alexandria County. A large portion of the retroceded land near the river was an estate of George Washington Parke Custis, who had supported the retrocession and helped develop the charter in the Virginia General Assembly for the County of Alexandria, Virginia. The estate (Arlington Plantation) would be passed on to his daughter (the wife of Robert E. Lee), and would eventually become Arlington National Cemetery.