 It is possible that there was only one such king, Olaf Guthfrisson of Vestfold, who in his earlier days ruled from Dublin and raided in Scotland and who later in 871 returned to claim his Vestfold kingdom.The Irish Three Fragments of Annals, while not actually proving such a theory, do support the case for regarding Olaf Guthfrithsson of Vestfold as being the same as Olaf the White of Dublin and the Scottish Isles.The Fragments claim that Olaf of Dublin ended his reign there when c. 871 he returned to Norway to support his father Guthfrith in a struggle for a kingdom.