Robert Alexander
Birth: 1633
Death: Jun. 1, 1704
Stafford County
Virginia, USA
Robert Alexander (1633-1704) was the son of John Alexander and Catherine (Graham) Alexander.
In October of 1659 when he was about 26 years old, his father filed the paperwork to establish a plantation named Caledon. Robert Alexander inherited the plantation in 1677, after his father passed away. A book entitled the "Annals of Alexandria" noted that Robert Alexander also inherited the upper part of the Howson Patent tract from his father, and left it to his two young sons named Robert and Charles in 1704.
Robert Alexander's brother named Philip Alexander, inherited the lower part of the Howson Patent tract. Philip Alexander had two sons, named Robert and Philip. Sixty acres of the lower part of the Howson Patent land were used about 70 years later, to found the city of Alexandria in July of 1749. The land grant for the city of Alexandria, was made by Captain Philip Alexander (1704-1753) and his cousin John Alexander (1711-1763).
https://en.wikipedia.org/wiki/Alexandria%2C_Virginia
A biography written for Robert Alexander's father provides some information about the Howson Patent tract, and the founding of Alexandria, VA.
http://www.JohnAlexanderNSDAR.org/bio.html
https://old.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=130424801