Although making diagnoses long after the fact is not an exactly science, based on recorded symptoms and medical observations made at the time it's likely that several major historical heroes or political figures also suffered from IBD. For example Alfred the Great - the 9th century Anglo-Saxon King of Wessex and a sort of Founding Father figure for the country of England suffered for all of his adult life with symptoms of Crohn's or UC.
More recently, at about the same time that Burrill Crohn was publishing the first formal description of the disease, a young, college-age, JFK was diagnosed with "colitis" that was successfully brought under control with high doses of corticosteroids. Prior to that he was constantly in abdominal pain and was losing a lot of weight. The long-term use of the steroids in turn trashed his bones, especially his vertebrae, making his chronic back problems worse and worse.
President Eisenhower also had symptoms of Crohn's and was treated with surgery to relieve a bowel blockage and remove section of diseased bowel.