Question: Who is the paternal grandfather of Grifo?
Sentence (from "Grifo"): On his escape in 747, his maternal great-uncle Duke Odilo of Bavaria provided support and assistance to Grifo, but when Odilo died a year later and Grifo attempted to seize the duchy of Bavaria for himself, Pepin, who had become sole major domo of the Frankish (Merovingian) Empire upon Carloman's resignation and retreat into a monastery, took decisive action by invading Bavaria and installing Odilo's infant son, Tassilo III, as duke under Frankish overlordship.
Relevant evidence: No