The efficient military might of the Ayyubids meant that they were not seriously threatened by local regimes during 55 years in power. The only disturbing element was the Zaydi imam who was active for part of the period. After 1217 the imamate was split, however.
The Ayyubids' military prowess ensured they were not significantly challenged by local rulers during their 55-year reign. The sole unsettling element was the Zaydi imam who exerted influence for a portion of the period. After 1217, the imamate was divided.