Board Thread:Naruto Discussions/@comment-31480387-20170309081722/@comment-25122992-20170309083059

Madara was the first one from Uchiha clan to awaken the MS, as it seems. And Indra doesn't belong to Uchiha, since there were no Uchiha in his age at all, but rather to the Ootsutsuki clan. So, Madara is just the first "documented" case of awakening the MS and the first Uchiha to do it.