On anthroponymic grounds Alpin may have been the brother of his predecessor Ciniod son of Uuredach as both have similar patronyms, the Pictish equivalent of the Old Irish Feredach, but no certain evidence exists for this identification, nor for an assumption that he was a member of the Cenél Loairn which might follow from it.
The Annals of Clonmacnoise name him Alpin, king of the Picts, and this reading is taken as the correct one.
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