His policy succeeded for a time, but following his abdication in a.d. 305, the empire continued to weaken, harassed by invaders and troubled by internal strife.
Invaders harassed the empire because they didn't like his policies.
mnli hypothesis: Invaders harassed the empire because they didn't like his policies. premise: His policy succeeded for a time, but following his abdication in a.d. 305, the empire continued to weaken, harassed by invaders and troubled by internal strife.