Hasan-i Sabbah vs Henry V

Hasan-i Sabbah and his followers seized the Alamut fortress in the Alborz mountains of northern Iran. This became the headquarters of the Nizari Ismaili state and the base from which he led a decentralized resistance against the Seljuk Empire.

Following the capture of Alamut, Hasan-i Sabbah established a network of mountain fortresses in Persia and Syria, creating a Nizari Ismaili state. This state operated as a decentralized theocracy, using strategic assassinations to counter Seljuk power.

The Seljuk vizier Nizam al-Mulk was assassinated by a Nizari Ismaili agent near Nahavand. This event demonstrated the reach of Hasan-i Sabbah's network and destabilized the Seljuk administration, contributing to the decline of Seljuk central authority.

After the death of the Fatimid caliph al-Mustansir, Hasan-i Sabbah supported the succession of Nizar over al-Mustali, leading to a schism. He established the Nizari Ismaili doctrine, emphasizing the authority of the imam and the use of taqiyya (dissimulation) for survival.

Hasan-i Sabbah died at Alamut, having led the Nizari Ismaili state for 34 years. He was succeeded by Kiya Buzurg Ummid. His legacy includes the creation of a resilient state that survived for over a century and the development of the Assassin legend.

Henry V was elected King of Germany in 1106 after rebelling against his father Henry IV, who died the same year. His accession marked the continuation of the Salian dynasty amid the Investiture Controversy.

Henry V led a military campaign to Italy in 1110-1111 to assert imperial claims over the Papal States and secure his coronation. He captured Rome and forced Pope Paschal II to concede investiture rights, but the agreement was later repudiated.

Pope Paschal II crowned Henry V Holy Roman Emperor in Rome on April 13, 1111, after Henry forced the Pope to grant him the right of investiture. The coronation followed a tense standoff where Henry imprisoned the Pope and cardinals.

Henry V and Pope Callixtus II signed the Concordat of Worms on September 23, 1122, ending the Investiture Controversy. The agreement gave the Church the right to elect bishops but allowed the emperor to invest them with secular authority.