Question: Who was the brother of Tostig Godwinson that overthrew Gruffydd, Rhiwallon, and Bleddyn?
Sentence (from "Bleddyn ap Cynfyn"): Bleddyn ap Cynfyn (Old Welsh: "Bledẏnt uab Kẏnỽẏn" ;   1073), sometimes spelled Blethyn, was an 11th-century Welsh king.
Relevant evidence: No