Question: Who is the maternal grandfather of Sibylla Of Lusignan?
Sentence (from "Isabella I of Jerusalem"): The High Court of Jerusalem stipulated that a committee of Western European rulers was entitled to choose between Sybilla and Isabella to succeed Baldwin V if he died before reaching the age of majority, but Sybilla and Guy of Lusignan were crowned soon after Baldwin V died in 1185.
Relevant evidence: No