Louis IV vs Umar

Louis IV of Bavaria was elected King of Germany by a faction of prince-electors, opposing Frederick the Fair. This election was part of a double election that led to a civil war between the Wittelsbach and Habsburg dynasties.

Louis IV of Bavaria defeated Frederick the Fair at the Battle of M

Louis IV of Bavaria was crowned Holy Roman Emperor in Rome by the Roman people, defying Pope John XXII who had excommunicated him. This act asserted imperial authority over the Papacy and led to a prolonged conflict with the Avignon Papacy.

Louis IV of Bavaria issued the Declaration of Rhense, which stated that the German king's election by the prince-electors alone conferred imperial authority without papal approval. This declaration strengthened the independence of the Holy Roman Empire from the Papacy.

Umar ibn al-Khattab became the second caliph after Abu Bakr's death. His ten-year reign saw the rapid expansion of the Islamic empire, including the conquest of the Sassanid Empire and Byzantine territories in the Levant and Egypt.

Umar's forces, led by Sa'd ibn Abi Waqqas, defeated the Sassanid army at the Battle of al-Qadisiyyah in 636. This victory led to the Muslim conquest of Iraq and later the fall of the Sassanid capital Ctesiphon, ending Persian imperial rule.

Umar's generals, including Khalid ibn al-Walid and Amr ibn al-As, conquered Byzantine Syria after the Battle of Yarmouk (636) and Egypt after the surrender of Babylon Fortress (641). These conquests added vast territories to the caliphate.

Umar instituted the Hijri calendar, dating from the migration (Hijra) of Muhammad to Medina in 622. This calendar became the standard for the Islamic world, used for religious and administrative purposes.

Umar was stabbed by a Persian slave named Abu Lu'lu'a while leading prayers in Medina. He died three days later, having appointed a council to elect his successor. His death marked the end of the first phase of rapid expansion.