 We can assume therefore that Younsmere hundred was created between 1086 and 1248, the date at which it appears as "Iwonesmere" in an unpublished Assize Roll.It also appears as "Hywelesmere" in the Assize Roll of the same year.The second spelling is evidently a confused recollection of the fact that Rottingdean and Ovingdean were previously in Welesmere hundred.