Henry IV of HRE vs Malik Shah I

Henry IV defeated Saxon rebels at Langensalza in Thuringia. The victory temporarily ended the Saxon Rebellion, but the conflict resumed later. The battle demonstrated Henry's military capability early in his reign.

Pope Gregory VII excommunicated Henry IV after Henry attempted to depose the Pope. The excommunication freed Henry's subjects from their oaths of loyalty, leading to a rebellion by German princes. This forced Henry to seek reconciliation at Canossa.

Henry IV traveled to Canossa Castle in northern Italy to seek absolution from Pope Gregory VII. He stood barefoot in the snow for three days before the Pope lifted his excommunication. This event symbolized the power struggle between secular and religious authority.

Henry IV besieged Rome and captured the city. He was crowned Holy Roman Emperor by Antipope Clement III. Pope Gregory VII took refuge in the Castel Sant'Angelo and was rescued by Norman forces under Robert Guiscard, who sacked Rome.

Malik Shah I's forces, commanded by his general Alp Arslan, defeated the Byzantine army at Manzikert in eastern Anatolia. Emperor Romanos IV Diogenes was captured, leading to a Byzantine civil war and opening Anatolia to Turkish settlement.

Under Malik Shah I and his vizier Nizam al-Mulk, the Seljuk Empire implemented a centralized administrative system. This included the establishment of the iqta' land-grant system, a standardized tax code, and the construction of caravanserais to promote trade.

Malik Shah I commissioned the expansion and renovation of the Great Mosque of Isfahan (Jameh Mosque). This project added four iwans and a large dome, transforming the mosque into a masterpiece of Persian-Islamic architecture and a model for later mosques.

Vizier Nizam al-Mulk was assassinated by a member of the Assassins (Nizari Ismailis) near Nahavand. His death removed a key stabilizing figure from the Seljuk court and contributed to the subsequent decline of the empire under Malik Shah's successors.

Malik Shah I died in Baghdad shortly after Nizam al-Mulk's assassination, possibly poisoned. His death triggered a succession crisis among his sons, leading to a period of civil war and fragmentation of the Seljuk Empire.