Question: Who is the paternal grandmother of Bertha Of Blois?
Sentence (from "Bertha of Rheinfelden"): Bertha of Rheinfelden( also Bertha of Bregenz)( b.c. 1065; d. after 1128), countess of Kellmünz, was the daughter of Rudolf of Rheinfelden and wife of Ulrich X of Bregenz.
Relevant evidence: No