During his captivity Eustace Graverius became regent of Jerusalem, and succeeded, with the aid of the Venetians, in repelling an Egyptian attack, and even in capturing Tyre, 1124.
It is written in unusually picturesque and vigorous language, and is based on the Roman de toute chevalerie, a French compilation made about 1250 by a certain Eustace or Thomas of Kent.
Godfrey of Bouillon, the leader of the expedition and the first king of Jerusalem, was duke of Lower Lorraine, and the names of his brothers Baldwin of Edessa and Eustace of Boulogne, and of Count Robert II.
He received his education first at La Roche, in the Arve valley, then at the college of Annecy, founded by Eustace Chappius, ambassador in England of Charles V., in 1549.
Being forfeited by his grandson Eustace FitzJohn in the reign of Stephen, Knaresborough was granted to Robert de Stuteville, from whose descendants it passed through marriage to Hugh de Morville, one of the murderers of Thomas Becket, who with his three accomplices remained in hiding in the castle for a whole year.