House of Meic Uilleim

Another thing I have been wondering as of late is what if the Meic Uilleim's under Domnall managed to get enough support to overthrow the King of Scotland of the time William the Lion in 1187? It is know that they seemed to control most of northern scotland by the time William was done with Galloway, so what if they got support from the clans and from Moray and from Galloway as well?
 
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