Barkiyaruq vs Lothair I

Following the death of his father Malik Shah I, Barkiyaruq was proclaimed sultan in Isfahan at age twelve. His claim was immediately challenged by his half-brother Mahmud I and his uncle Tutush I, initiating a decade-long succession war.

Barkiyaruq's forces defeated the army of his uncle Tutush I, the Seljuk ruler of Syria, near Rayy. Tutush was killed in battle, eliminating a major rival and securing Barkiyaruq's control over the eastern Seljuk domains.

Barkiyaruq fought a series of campaigns against his half-brother Muhammad I Tapar, who rebelled with support from the Abbasid Caliph. The conflict lasted for years, draining Seljuk resources and preventing a unified response to the First Crusade.

Barkiyaruq and Muhammad I Tapar agreed to a partition of the Seljuk Empire. Barkiyaruq retained the title of sultan and control over western Persia and Iraq, while Muhammad ruled the eastern provinces. The treaty temporarily ended the civil war.

Barkiyaruq died of tuberculosis at age 25 in Isfahan. His death left Muhammad I Tapar as the sole sultan, but the Seljuk Empire remained weakened by years of internal conflict and the ongoing Crusader presence in the Levant.

Lothair I was crowned co-emperor by Pope Paschal I in Rome, receiving the imperial title from his father Louis the Pious. This coronation affirmed Lothair's status as the senior heir and future ruler of the Carolingian Empire, though it later led to conflict with his brothers.

Lothair I led a rebellion of nobles against his father, Emperor Louis the Pious, resulting in Louis's temporary deposition. Lothair seized power but was later forced to restore his father after the intervention of his brothers. This event deepened family divisions.

Lothair I's forces were defeated by the combined armies of his brothers Louis the German and Charles the Bald at Fontenoy-en-Puisaye. The battle was a bloody civil war that weakened the Carolingian dynasty and led directly to the negotiations for the Treaty of Verdun.

Lothair I, along with his brothers Louis the German and Charles the Bald, signed the Treaty of Verdun, dividing the Carolingian Empire into three kingdoms. Lothair received Middle Francia, including the imperial title and the cities of Aachen and Rome.

Lothair I abdicated the throne and divided Middle Francia among his three sons: Louis II (Italy and imperial title), Lothair II (Lotharingia), and Charles (Provence). He then retired to Pr