Zaydi Shia imamate founded by al-Mansur al-Qasim of the Qasimi dynasty that expelled the Ottomans from Yemen by the 1630s and, at its height under al-Mutawakkil Isma'il, ruled the whole of Yemen from Asir to Dhofar - the strongest Zaydi state ever to exist.
Declined through succession disputes, tribal insubordination and the secession of coastal and southern territories (Lahej 1728/1740; Wahhabi raids on the Tihama after 1803); reincorporated into the Ottoman Empire in 1849 with the Zaydi polity descending into chaos, and the Ottomans directly reoccupied Sana'a in 1872 (contested end date - see could_not_verify).
Standard English-language political history of Yemen whose early chapters cover the Qasimi dynasty imamate, its expulsion of the Ottomans and its 18th-19th century decline.
Cambridge history that opens with the Zaydi imamate as the background to the modern Yemeni state; verified via Open Library.