alternatehistory.com

This is probably a subjective question, since the historical sources are not completely reliable, and the definition of "madness" varies from person to person. Vote on which Roman Emperor you consider to have been the least mentally stable, and, if you care to do so, justify your answer in the comments section.

Note that poor political decisions should not be considered to be evidence of mental instability ipso facto, though there may be some exceptions.
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