 It is unclear how seriously William's involvement was considered, but in the end he escaped implication and was released in March 1128 having given an oath of loyalty to Clito.However, by this stage Clito had alienated most of his allies and faced a new opponent Thierry of Alsace, who was the son of Gertrude, the daughter of Robert the Frisian.Clito was killed in July 1128 at the siege of Aalst, leading to Thierry being confirmed as Count.