 This north part of the island later thus marked Laleham Burway (also called the Burway) was divided from the Abbey Mead of Chertsey by a seasonal ditch, the Burway Ditch, and by another from the meadow of Mixnams on the north.The triangle was equally Chertsey parish, but belonged to the manor of Laleham.It is mentioned as the Island of Burgh in the original endowment of Chertsey Abbey between 666 and 675, and is described as separated from Mixtenham (or "Mixnams") "by water", which formed part of the boundary of the abbey lands, but it is not clear which of the two lay within the bounds of the abbey.