The nephew of Galerius, Maximinus "Daia" was chosen as his eastern
Caesar under the shaky Tetrarchy of Diocletian. He was sent to oversee Syria and
Egypt where he awaited his turn at being emperor of the east half of the empire.
Unfortunately for him, the western Caesar, Severus II, was defeated by the
usurper Maxentius. This in turn forced Galerius to name Licinius as his
replacement. Galerius died in 311 and Licinius, not Maximinus, was elevated to
Augustus totally sidelining Maximinus who was the senior Caesar. Maximinus was
upset about this, to say the least, but somehow or other he and Licinius patched
up their differences and the status quo was preserved for the time being.
Licinius would then stir up trouble again, however, by aligning himself with
Constantine who would then go on to defeat the forces of Maximian and Maxentius
(a secret ally of Maximinus). Maximinus could bear no more and realized that he
was probably next on the chopping block. Taking the initiative, he went on the
warpath and declared war on Licinius. Licinius had the upper hand militarily
though and was able to defeat him in two separate battles. Maximinus was killed
or committed suicide and Licinius had his family executed as well.