Agnes de Washington married Edmund Lawrence, son of John Lawrence and Elizabeth Holt, circa 1369.1,2 Agnes died after 1406.1

    In 1406 Simon, formerly a servant of Robert de Washington, released all his claims to lands in Bolton to Agnes.1

    Agnes de Washington was a member of a family originally from Durham, which established itself in north Lancashire during the fourteenth century. In the sixteenth century they moved south to Northampton, and later westward to Virginia. In 1789 George Washington was elected the first President of the United States of America. Agnes de Washington, once the mistress of Ashton Hall, was unquestionably a kinswoman of the great founding father.3

    The parentage of William de Lancaster, lord of Kendal, by George Washington, states that Agnes was the granddaughter and ''''''ultimately the sole heiress of Robert de Washington, M. P. for Westmorland in 1300,'''''''''' and his wife, Joan de Strickland.2 However, I believe she was the great-granddaughter of Robert Washington and Joan de Strickland. A lineage chart in the club house at the Lancaster Golf Course which is built onto the original Ashton Hall, shows Agnes as a daughter of Robert de Washington and Margaret. This Robert de Washington was probably the son of Robert de Washington (son of Robert de Washington and Joan de Strickland) and his wife Agnes.

Family Edmund Lawrence b. s 1310, d. 1381 Children

   Robert Lawrence b. c 1371, d. 8 Sep 1439
   James Lawrence
   William Lawrence
   John Lawrence d. a 1432

Citations

   [S272] Farrer, William and J. Brownbill editors. The Victoria History of the County of Lancaster. 8 volumes. London, England: A. Constable and Company, 1906-14).
   [S2379] "The parentage of William de Lancaster, lord of Kendal," Transactions of the Cumberland and Westmorland Antiquarian and Archaeological Society, New Series, 1962.
   [S871] Shennan, J. H. A History of Lancaster Golf Club. Lancaster, England: Lancaster Golf Club Ltd., 2001.

http://www.lawrencefamhis.com/ashton-o/p230.htm#i5729