Gille Ruadh[note 1] was the Galwegian leader who led the revolt against King Alexander II of Scotland.
Thomas also seems to have gained support from Ruaidrí mac Ragnaill and the Uí Domnaill of Tír Conaill.
Gille Ruadh and Thomas escaped to Ireland, Alexander returned north, and Walter Comyn, Earl of Menteith, was left to subdue the province, ravaging the lands and monastic establishments (Glenluce Abbey and Tongland Abbey were both sacked, and their abbots punished).
However, for an unknown set of reasons, Gille Ruadh abandoned Thomas and gave himself up on favorable conditions to Patrick II, Earl of Dunbar.
The failure of the revolt ensured the death of the Lordship of Galloway as a united and distinct sub-kingdom of northern Britain.