Marcus - usurper - died in 407.
Celsus - usurper - died in 265.
Marcellus - usurper - died in 366.
Bonosus - usurper - died in 281.
Censorinus - usurper - died in 269.
Constantine Doukas - usurper - died in 913.
Constans II - usurper - died in 411.
Septimius - Roman emperor usurper - died in 271.
Conan the Usurper was created in 1967.
Marcus Allen is still alive.
Marcus Burrowes died in 1953.
Marcus Musurus died in 1517.
Marcus Pløen died in 1836.