"Though the two Óttars and Thorfin are attested historical figures, and a considerable amount of circumstantial evidence suggests that they belong to the same family, their precise father-son relationships and also their ancestry of Therulfe are unambiguously stated only in a lost manuscript once belonging to the Cotter family of Cork.The document was discovered at Rockforest following the death of Sir James Cotter the second baronet in 1829.