Yeo Vale was originally owned by the at Yeo family, which the estate was named after, but it ended up passing to the Giffard family through marriage.
The earliest known holder was the at Yeo (alias atte Yeo) family, which took their surname from the estate. Geoffrey Giffard (fl.1439), who married Emma or Jone at Yeo, the heiress of Yeo. He was the son of Simon Giffard (fl.1410), by his first wife Emma de Bowey, a daughter and co-heiress of John de Bowey, and was 5th in descent from Walter Giffard of Clifford, whose nephew was Bartholomew Giffard (fl.1290) of Halsbury, the first of the family seated at Halsbury, which estate he obtained by marriage to the heiress of Peter de Halsbury. 
