What was Diocletian greatest accomplishment I am the Roman Empire?

Diocletian's greatest accomplishment was the stabilization of the Roman Empire during a period of crisis through significant administrative reforms. He divided the empire into the Eastern and Western halves, creating a more manageable governance structure. Additionally, he implemented the Diocesan system, establishing provinces ruled by governors, and introduced the Edict on Maximum Prices to combat inflation. These measures helped restore order and extend the empire's longevity.