Pictland was not solely influenced by Iona and Ireland. It also had ties to churches in Northumbria, as seen in the reign of Nechtan mac Der Ilei. The reported expulsion of Ionan monks and clergy by Nechtan in 717 may have been related to the controversy over the dating of Easter, and the manner of tonsure, where Nechtan appears to have supported the Roman usages, but may equally have been intended to increase royal power over the church. Nonetheless, the evidence of place names suggests a wide area of Ionan influence in Pictland. Likewise, the "Cáin Adomnáin" (Law of Adomnán, "Lex Innocentium") counts Nechtan's brother Bridei among its guarantors.