Agnes was the only daughter and heir of Robert De La Beche the last male of this line. The De La Beche land "called Beeches, situate neer Okingham, a market towne in the countye of Barkes", passed from her to the Whitlocks. The land had been given to William De La Beche by Robert De Bingham,Bishop of Salibury in 1231. This family was contemporary with and presumedly related to the De La Beches of Aldworth. The entry in Henry Lee Whitlock's Family Tree reads: "32 Henry VI 1454 Married Johannes Whitlock intailed by Agnes De La Beche 31 Henry VI before marriage"