Question: When was Dirk V, Count Of Holland's mother born?
Sentence (from "Gertrude of Saxony"): Gertrude of Saxony (1030 – August 4, 1113), also known as Gertrude Billung, was a countess of Holland by marriage to Floris I, Count of Holland, and countess of Flanders by marriage to Robert I, Count of Flanders.
Relevant evidence: Yes