From 235, over a period of 50 years, 49 men were proclaimed emperor by different groups of soldiers. We know that at least 25 of them were killed, not counting the three who committed suicide and one who seems to have been struck by lightning. In fact, apart from Gothicus, only one of them is known to have died a natural death - Valerian, who held on to the job for seven years and was safely locked away as a prisoner of the Persians when he expired in 260.