King Drest may not have had a secure hold on power. One Simul son of Drest, perhaps yet another sibling of Nechtan, was imprisoned by Drest in 725. In the same year, Brec of Fortriu died. He is assumed from the context to be the bishop of Fortriu, almost certainly appointed by Nechtan and the earliest known bishop in Pictland. In 726, Drest had Nechtan imprisoned. This may have involved no more than removing the former king from one monastery, where he had friends and influence, to another where Drest's partisans were in control.