Marcus Annius Florianus
Marcus Annius Florianus was the half brother of Tacitus and was chose by the western armies to succeed him after his death in 276. However this was not agreed upon by the senate.
It was during battle that he discovered that the army in the east had elected Probus as emperor, and he unfortunately had the benefit of support from Italia, Gaul, Hispania, Britain, Africa and Mauretania. A battle followed between the two emperors and although Florianus had a larger army at the time, Probus was more of an experienced general and was more likely to come out victorious. The army of Florianus saw this and were quick to assassinate him.