Diocletian and the Tetrarchy

What happened

Coming to power in 284 CE, Diocletian ended the crisis with sweeping reforms. He divided rule of the Empire among four emperors — two senior Augusti and two junior Caesars — in a system known as the Tetrarchy, and reorganized the army, provinces, and taxation.

Why it matters

Diocletian's reforms stabilized the Empire and formalized the split between its western and eastern halves.

Sources

• World History Encyclopedia. Diocletian · Reputable source