Question: Who is William Fitz Duncan's paternal grandmother?
Sentence (from "William fitz Duncan"): William fitz Duncan (a modern anglicisation of the Old French Guillaume fils de Duncan and the Middle Irish Uilleam mac Donnchada) was a Scottish prince, a territorial magnate in northern Scotland and northern England, a general and the legitimate son of king Donnchad II (Duncan II) of Scotland by Athelreda (Ethelreda) of Dunbar.
Relevant evidence: Yes