What condition could lawyers have argued that Louis Riel had suffered from when he led the Northwest Rebellion?

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Megalomania is a condition characterized by delusions of grandeur and an inflated sense of self-importance. This could have been argued as a condition that Louis Riel suffered from when he led the Northwest Rebellion, as he believed that he was a prophet and that he had a divine mission to lead the Métis people to independence.

What Condition Could Lawyers Have Argued That Louis Riel Had