Umar ibn al-Khattab became the second of the Rightly Guided Caliphs in 13 AH after the death of Abu Bakr al-Siddiq.
Abu Bakr had nominated Umar for the caliphate after consulting leading Companions, and the Muslims accepted his leadership.
Umar’s caliphate lasted approximately ten years and witnessed major territorial expansion, important military campaigns and the development of administrative institutions.
The Beginning of Umar’s Caliphate
At the beginning of his caliphate, Umar continued the campaigns against the Byzantine and Sasanian powers that had begun during Abu Bakr’s rule.
One of his notable decisions was to remove Khalid ibn al-Walid from overall command and appoint Abu Ubaydah ibn al-Jarrah instead. This was not based on an accusation of betrayal or incompetence, but reflected Umar’s judgment about military leadership and his concern that people might become overly attached to a particular commander.
In Iraq, the fighting against the Persians continued, with al-Muthanna ibn Harithah playing an important role before Sa'd ibn Abi Waqqas assumed command.
The Battles in Iraq
The early years of Umar’s rule witnessed several battles against the Sasanian forces, including al-Namariq, al-Saqatiyyah, the Battle of the Bridge and al-Buwayb.
The Battle of the Bridge was particularly difficult for the Muslims, during which their commander Abu Ubayd ibn Masud al-Thaqafi and many Muslim soldiers were killed.
The Muslims later achieved victory at al-Buwayb, followed by the appointment of Sa'd ibn Abi Waqqas as commander in Iraq.
The Conquest of Damascus and the Battle of al-Qadisiyyah
During 14 AH, major events took place in Syria and Iraq. Damascus was conquered during this period, although historical accounts differ regarding the precise terms of its conquest.
The same year witnessed the Battle of al-Qadisiyyah, one of the most significant confrontations between the Muslims and the Sasanian Empire.
The battle ended with a Muslim victory and became an important turning point in the campaign against the Persian Empire.
The Conquest of Syria and Jerusalem
Muslim armies expanded their control across Syria during Umar’s caliphate. Several cities and regions came under Muslim rule, including Homs, Hama, Baalbek, Qinnasrin, Aleppo and Antioch.
The conquest of Jerusalem was another major event of Umar’s caliphate. Umar traveled to Syria and received the city in an event that became one of the best-known episodes of his life.
Military operations against the Byzantine Empire continued, and Muslim authority expanded across significant parts of the region.
The Conquest of Ctesiphon and Jalula
Muslim forces continued their advance in Iraq and captured Ctesiphon, the capital of the Sasanian Empire.
The Battle of Jalula followed, ending in another Muslim victory.
Further campaigns then extended Muslim influence into large areas of Iraq and Persia.
The Adoption of the Hijri Calendar
One of Umar’s most significant administrative initiatives was the adoption of the Hijri calendar for official affairs.
The system was introduced in response to the need for a clear method of dating official correspondence and transactions. The Hijrah of the Prophet Muhammad to Medina was established as the starting point of the Islamic calendar.
The Hijri calendar subsequently became one of the enduring institutions of the Muslim world.
The Founding of Kufa and Basra
During Umar’s caliphate, important garrison cities were established, most notably Kufa and Basra in Iraq.
Their development was connected with the expansion of the Muslim state and the settlement of military forces in newly conquered regions.
Both cities later became major centers of scholarship, politics, commerce and Islamic culture.
The Organization of the Diwans and Stipends
Umar paid considerable attention to the administration of the growing Muslim state.
His government organized registers, stipends and military affairs and closely monitored provincial governors.
He also became associated with the title Amir al-Mu'minin, meaning Commander of the Believers.
The Year of the Ramadah and the Plague of Amwas
Umar’s caliphate also experienced serious crises. Among them was the Year of the Ramadah, when severe drought and famine affected parts of Arabia and the surrounding regions.
Umar sought assistance from provincial governors and worked to provide food and supplies for the population. He also led the people in seeking rain and sought the supplication of al-Abbas ibn Abd al-Muttalib.
Around the same period, the Plague of Amwas struck Syria and caused the deaths of many Muslims, including several prominent Companions.
Abu Ubaydah ibn al-Jarrah was among those who died during the plague.
The Conquest of Egypt and Alexandria
During Umar’s caliphate, Muslim forces under Amr ibn al-As advanced into Egypt and eventually conquered Alexandria.
Historians differ over some details of the chronology of the Egyptian conquest, but its completion was one of the major developments of Umar’s rule.
The conquest expanded the Muslim state westward and made Egypt an important part of the emerging Islamic realm.
The Battle of Nahavand
The Battle of Nahavand, fought in 21 AH, was one of the major battles in the later phase of the Muslim-Persian wars.
The Muslim victory opened the way for further campaigns into Persian territories.
Subsequent operations reached regions including Isfahan, Qom, Kashan, Rayy, Qumis, Gorgan, Azerbaijan and other areas.
Expansion into Persia and Khurasan
The Muslim state expanded significantly eastward during Umar’s caliphate.
Muslim forces reached large areas of Persia and Khurasan, while campaigns extended into regions such as Rayy, Qumis, Gorgan, Azerbaijan, Qazvin, Zanjan and Tabaristan.
These campaigns transformed the political landscape of a large part of the region.
The Story of Sariyah ibn Zunaym
One of the famous stories associated with Umar is the account of Sariyah ibn Zunaym and the statement reportedly attributed to Umar while delivering a sermon: “O Sariyah, the mountain! The mountain!”
The story is mentioned in historical and biographical works as one of the extraordinary events associated with Umar.
However, scholars have discussed the details and strength of the various reports concerning the story, so its widespread circulation should be distinguished from establishing every detail as authentic.
Umar’s Final Hajj
Umar performed Hajj with the Muslims in 23 AH, and it was his final pilgrimage.
During this period, military campaigns in Persia continued while Umar remained involved in administering the affairs of the expanding Muslim state.
After his return to Medina, the incident that eventually led to his death took place.
The Death of Umar ibn al-Khattab
Umar died in 23 AH after being stabbed by Abu Lu'lu'ah during the dawn prayer.
Historical accounts state that Abu Lu'lu'ah attacked Umar with a double-edged dagger and inflicted several wounds, one of which proved fatal.
Before his death, Umar appointed a council of six prominent Companions to determine the next caliph: Uthman ibn Affan, Ali ibn Abi Talib, Talhah ibn Ubayd Allah, al-Zubayr ibn al-Awwam, Sa'd ibn Abi Waqqas and Abd al-Rahman ibn Awf.
The consultation ultimately resulted in the selection of Uthman ibn Affan as the next caliph.
Who Was Umar ibn al-Khattab?
Umar ibn al-Khattab ibn Nufayl was a member of Quraysh and belonged to the Adi clan.
He was known by the kunyah Abu Hafs and became famous as al-Faruq.
Before Islam, Umar held a respected position among Quraysh. He accepted Islam in the sixth year of the Prophetic mission, and his conversion became an important event in the early history of the Muslim community.
The Conversion of Umar
Several reports describe the circumstances surrounding Umar’s conversion.
One well-known account states that Umar initially set out intending to confront the Prophet Muhammad, but after learning about the conversion of his sister and her husband, he encountered a Quranic passage being recited and was deeply affected before going to the Prophet and accepting Islam.
The Prophet had prayed that Islam would be strengthened through the conversion of one of the two prominent Umars, and Umar’s acceptance of Islam became a major development in the Meccan period.
Umar’s Migration to Medina
Umar migrated from Mecca to Medina and became one of the prominent Companions who joined the Muslim community there.
He was known for his courage and strong personality and became one of the major supporters and defenders of the Muslim community.
He participated in major events alongside the Prophet Muhammad.
The Virtues of Umar ibn al-Khattab
Umar was among the most prominent Companions of the Prophet and was widely known for his strength, justice and firmness.
Numerous hadiths describe his virtues. One famous narration states that Satan would avoid a path taken by Umar.
Umar was also known for opinions that later coincided with Quranic revelation in several situations, commonly discussed in the Islamic scholarly tradition as his “وافقات” or concordances.
The Major Achievements of Umar’s Caliphate
Among the major developments associated with Umar’s rule were the organization of administrative registers, the adoption of the Hijri calendar, the regulation of stipends, supervision of governors, development of judicial and administrative systems, establishment of major garrison cities, and the expansion of Muslim rule across Syria, Iraq, Egypt and Persia.
His approximately ten-year caliphate became one of the most consequential periods in the history of the early Muslim state.
When did Umar ibn al-Khattab become caliph?
Umar became caliph in 13 AH after the death of Abu Bakr al-Siddiq.
What were the major conquests during Umar’s caliphate?
Major campaigns included the conquest of Syria, Jerusalem, Iraq, Egypt and large parts of Persia and Khurasan.
When was the Hijri calendar adopted?
The Hijri dating system was adopted during Umar’s caliphate, with the Hijrah established as the basis of the Islamic calendar.
What were Umar’s major administrative achievements?
They included organizing registers and stipends, supervising governors, establishing garrison cities and developing administrative and judicial structures.
How did Umar ibn al-Khattab die?
He died in 23 AH after being stabbed during the dawn prayer by Abu Lu'lu'ah. Before his death, he established a six-member council to determine his successor.
