The first colonial landowners in the present-day District of Columbia were George Thompson and Thomas Gerrard, who were granted the Blue Plains tract in 1662, along with Saint Elizabeth, and other tracts in Anacostia, Capitol Hill, and other areas down to the Potomac River in the following years. Thompson sold his Capitol Hill properties in 1670, including Duddington Manor, to Thomas Notley; The Duddington property was handed down over the generations to Daniel Carroll of Duddington. As European settlers arrived, they clashed with the Native Americans over grazing rights. In 1697, Maryland authorities built a fort within what is now the District of Columbia. In that same year, the Conoy relocated to the west, near what is now The Plains, Virginia, and in 1699 they moved again, to Conoy Island near Point of Rocks, Maryland.