 In 1176 he was among those present when the will was read of Ermessende of Pelet, countess of Melgueil.In 1177 he joined Bernard Ato V of Nîmes and Agde, Countess Ermengarde of Narbonne, and his nephews William VIII and Gui Burgundion, in an alliance in opposition to Raymond V of Toulouse, who now ruled Melgueil as widower of Ermessende of Pelet.According to her Occitan "vida" (in the "Biographies des Troubadours"), the trobairitz Azalais de Porcairagues was the lover of Gui Guerrejat; her one surviving poem seems to be addressed to him.