Either standing or sitting, but especially when he lay asleep, he had a majestic and graceful apearance; for he was tall, but not slender. His grey locks became him well, and he had a full neck. But his knees were feeble, and failed him in walking, so that his gait was ungainly, both when he assumed state, and when he was taking diversion. He was outrageous in his laughter, and still more so in his wrath, for then he foamed at the mouth, and discharged from his nostrils. He also stammered in his speech, and had a tremulous motion of the head at all times, but particularly when he was engaged in any business, however trifling.

Though his health was very infirm during the former part of his life, yet, after he became emperor, he enjoyed a good state of health, except only that he was subject to a pain of the stomach. In a fit of this complaint, he said he had thoughts of killing himself.