In 1325, the Zaidite dynasty restricted the Rasulids to South Yemen. 1449, the latter were completely defeated by the Zaidites.
After the Second French-Seljuk War (1635-46), in the peace of Györ, France took the strategically important Aden. The Rum-Seljuks reconquered it in the anti-French War, together with Jerusalem and the Sinai.
1717-23, France used the opportunity, allied with Persia and stroke against the Rum-Seljuks in the Fourth French-Seljuk War. The French again occupied the Sinai and Aden, while Persia took the prestigious Holy Cities of Islam.
When France became a republic, and was subsequently cut off from its colonies in the French Republican Wars, Persia used the opportunity to take Aden back.