Question: Who is the paternal grandfather of Lambert I, Count Of Louvain?
Sentence (from "Lambert I, Count of Louvain"): "The Bearded" (born in Louvain, Duchy of Lotharingia, East Francia c. 950, died in Florennes, County of Namur, Duchy of Lower Lorraine, Holy Roman Empire on 12 September 1015) was the first Count of Louvain in 1003.
Relevant evidence: No