 Between 1103–1106 Robert de Brus attested with Ralph de Paynel and 16 others a charter of William, Count of Mortain, to the abbey of Marmoutier.In 1109 at a Council of all England held at Nottingham, he attested the charter of King Henry I confirming to the church of Durham certain possessions which the men of Northumberland had claimed.During the period 1109–1114 he appears in early charters in possession of numerous other manors and lands in Yorkshire, and in the same period he attested a charter of Henry I issued at Woodstock, Oxfordshire.