Question: Who is Petronilla Of Lorraine's maternal grandmother?
Sentence (from "Petronilla of Lorraine"): Petronilla of Lorraine (1082 – 23 May 1144) was Countess of Holland by marriage to Floris II, Count of Holland, and regent of the County of Holland during the minority of her son Dirk VI in 1121-1129.
Relevant evidence: No