Ottir
Earl Ottir (; ; died 918), also known as Ottir the Black (), was a jarl who occupied a prominent position among the Norse of Britain and Ireland in the early 10th century. He is believed to be the founder of the settlement, Veðrafjǫrðr (present day Waterford) in the year 914. From 917 to his death in 918 Ottir was a close associate of the powerful overking Ragnall ua Ímair, although they are not known to have been related. Ireland and family In Ireland, Ottir is particularly associated with raiding and conquests in the province of Munster. The Cogad Gáedel re Gallaib describes him raiding there alongside Ragnall and associates this with the Viking settlement of Cork. Their base for this activity was present day Waterford Harbour. Later the same epic describes Ottir conquering the eastern part of Munster from his seat at Waterford, but it is unclear if he ruled it as king outright or was in any way subject to Ragnall, because the annals offer a different chronology. Joan Radner has suggested that Ottir is identical to the Ottir mac Iargni who is recorded in the Annals of Ulster killing a son of Auisle in alliance with Muirgel