Fearghal continued to push his claim and garner support and he eventually killed his brother Sean before launching a full-scale rebellion against Eoghan na Feosaige in 1427.
Fearghal continued to push his claim and garner support for a number of years. He eventually killed his brother Sean to solidify his position as the chief of Clan Mahon before launching a full-scale rebellion against Eoghan na Feosaige in 1427.