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De primo Saxonum adventu, an 11th- or 12th-century compilation from earlier sources, notes that after the death of Osulf, Northumbria was divided into two parts: Eadulf Evil-child receiving the lands between the Myreford (arguably the Firth of Forth) and the River Tees and Oslac receiving the lands between the Humber Estuary and the Tees.
De primo Saxonum adventu claims that Oslac, along with Eadulf of Bamburgh and Ælfsige Bishop of Chester-le-Street, escorted the Scottish king Kenneth II to the Wessex-based Edgar: The two earls Oslac and Eadwulf along with Ælfsige, who was bishop of St Cuthbert 968—90, conducted Cinaed to king Edgar.