Hazrat Omer's Caliphate Era 13 AH-23 AH By Hafsa19 13 Appointed as Caliph 13 Established Government and Laws 13 Battle of Bridge 14 Established Education System 14 Fall of Damascus 15 Battle of Qadsiyah 15 Battle of Yarmuk 16 Conquest of Jerusalem 16 Military introduced as State Department 17 Renovation of mosques in Makkah and Madinah 17 Introduced Islamic Calendar 17 Drought in Arabia 17 Headstone laid to build a canal 17 Conquest of Persia 18 Plague in Syria & Palestine 20 Established provinces 20 Established Bait-al-Mal Period: 21 to 23 Conquered Persia completely 23 Martyred
