In La Tavola Ritonda, Tristan assists his future father-in-law, Gilierchino, in quashing a rebellion led by Gilierchino’s nephew, Albroino. Maccabruno was another uncle of Albroino, whom he joined in the war.
He commanded the city of Gippa, which he surrendered to Tristan and Gilierchino after Albroino’s death.
Source
La Tavola Ritonda | 1325–1350