Hasan was born in the month of Sha'aban (January-February 625) or 15 Ramadan (1 March) in the 3rd year after the emigration to Medina. His father (Ali) wanted to give him the name Harb (war), but his grandfather, Prophet Muhammad (pbuh) named him Hasan, which was not a common name during the Age of Ignorance, and he added the title Abu Muhammad. Prophet Muhammad recited the call to prayer in Hasan's ear, and he sacrificed an animal on the seventh day after the child's birth. Prophet Muhammad also told Fatima to give silver equal in weight to the weight of his hair to the poor. In some sources, it is reported that Abu Bakr said: "O Hasan, who is like the Prophet, not Ali," and Ali smiled at this expression.
Hasan, like his brother Hussein, did not get involved in the important events that occurred during the first caliphate. Hasan joined the Khorassan Campaign that was led by Said ibn As during the caliphate of Uthman. He was assigned by his father to protect Uthman against the rebels and to carry water to his home with his brother.
After his father was chosen as caliph, Hasan went to Qufa with Ammar ibn Yasir to persuade the people of Qufa to join his father against the rebels, Talha ibn Ubaydullah and Zubayr ibn Awwam. He was with his father in the Jamal Incident and the Battle of Siffin. After Ali was martyred, Ubaydillah ibn Abbas ibn Abdulmuttalib invited the people of Qufa to make a pledge of allegiance to Hasan. According to one account, they pledged allegiance to Hasan either on the same day or two days later. When asked about making a pledge to Hasan a short time before he had died, Ali had said: "I neither order it nor prohibit it." However, the Shiites believe that Ali had made Hasan his heir.
Muawiyah ibn Abu Sufyan was informed that Ali had been martyred and Hasan had now been chosen as caliph. He started intense activity to gather supporters and to get the people of Qufa on his side. He gathered an army composed of units from Syria, Palestine and Algeria led by Abdullah ibn Amir. Abdullah ibn Amir went to Madain and stood in front of the army of Hasan, which had left the city. He told them that Muawiyah had besieged Anbar, that they had no intention to fight, and that any soldiers who might take refuge with them including Hasan would be forgiven. In response to these words, it became clear that the majority wanted to avoid a war. Hasan returned to Madain to inform Abdullah ibn Amir of the terms for handing over the caliphate to Muawiyah.
Hasan's terms were as follows:
Abdullah ibn Amir took Hasan's terms to Muawiyah. Muawiyah wrote the terms down, sealed them and returned them to Hasan (Rabi' al-awwal 25, 41 / July 29, 661).
Hasan was pleased that Muawiyah had accepted his terms. He informed Qays ibn Sa'd of the treaty and ordered him to hand over his authority to Muawiyah and to return to Madain. At the time, some people like Hussein and Hujr ibn Adi opposed the agreement between Hasan and Muawiyah, as they thought that Hasan had brought his fellow Muslims into contempt by making this treaty. However, Hasan did not change his mind; he went to Qufa from Madain with his men and confirmed the treaty with Muawiyah.
Because of this event, the 41st year of Islamic history was called Amu al-Jamaa (the year of reunification). Although Hussein strongly opposed him, Hasan made a treaty in accordance with Prophet Muhammad's opinion (Bukhari, "Sulh", 9; "Fitan", 20), preventing blood shed between Muslims, and providing a peaceful and quiet environment for people, at least for a short time. Hasan went to Medina later with his family and lived a life removed from politics. According to some sources, he was poisoned by his wife Ja'da bint al-Ash'ath ibn Qays, who was encouraged to do this with the promise of marriage to Yazid ibn Muawiyah. Hasan died Safar 28, 49 (April 7, 669).
Before his death Hasan said that he wanted to be buried next to the tomb of Prophet Muhammad or in the Jannat al-Baqi cemetery, next to the tomb of his mother, if the first option was not possible. Marwan ibn Hakam refused the first option and Hasan was buried next to his mother in the Jannat al-Baqi cemetery after Said ibn As, the governor of Medina, led his funeral prayer.
Hasan was known by names such as Mujtaba (The Chosen One), Taqi (The Pious One), Zeki (The Intelligent One) and Sibt (Grandson). He was a mild, generous, sedate man who abstained from politics and disorder. There are various opinions as how long he served as caliph; according to some writers, he held the caliphate for four months and three days, according to others this period lasted for six months and three days. Since the treaty with Muawiyah was made on 25 Rabi' al-awwal 41 (July 29, 661), the latter claim is probably more accurate. Hasan reported thirteen hadiths (sayings of the Prophet) directly from Prophet Muhammad (pbuh), his mother and his father. Abu'l- Hawra, Sa'di, Sha'bi, Hubayra ibn Yarim, Asbagh ibn Nubata and Musayyab ibn Nacaba conveyed hadith accounts from Hasan that he told his sons Hasan and Suwayd ibn Ghafala.
It is reported that Hasan, also known by the name Mitlaq (The Divorcer) made as many as 100 marriages; and according to Ibn Sahrasub, he had as many as 250 or 300 concubines. However, Baqir al-Quraishi, who carried out careful research into his life, contradicted these accounts, stating that he had only made thirteen marriages.
How many children Hasan fathered is a matter open to debate; it has been related at different times that the number of children, including sons and daughters, was twelve, fifteen, sixteen, nineteen, twenty or twenty-two. In the sources, the names of his children were reported as the following: Zayd, Hasan, Qasim, Abu Bakr, Abdullah, Amr, Abdurrahman, Hussain, Muhammad, Jacob, Ishmael and Talha. Historians agree that his descendents continued with his sons Hasan al-Muthanna and Zayd. The people who descended from Hasan were given the title "sharif". In history there are many dynasties founded from this family, such as the Idrisis, Rassis, Sadis and the present Filalis (Morocco) and Hashimites (Jordan).
The sources convey various examples of Prophet Muhammad's indulgence to his grandchildren and state that he loved his two grandchildren, whom he called the "masters of heaven" and for whom he prayed to Allah "My Lord, I love them, may You love them, too". Prophet Muhammad did not hesitate to fulfill their requests, put them on his shoulders and carry them or to play games with them; they even climbed over him while he was praying. He would not stand up until the prayer was over. One of these accounts is as follows: One day Prophet Muhammad was at the pulpit, and when he saw that Hasan and Hussein entered the Masjid and fell down; he stopped speaking and embraced them close to his heart, saying: "How true it is when the Almighty says that your goods and children are means for testing"; (et-Teghabun 64/15) I could not help myself when I saw them." He then continued with his sermon. (Ibn Maja, "Libas", 20; Tirmizi, "Manaqib", 30; Nasai, "Jum'a", 30, "Jidayn", 27;).
For some Sunni scholars, Hasan is accepted as the fifth and last of the four caliphs, ruling from the time of his father's death until he handed the caliphate over to Muawiyah ibn Abu Sufyan. According to Shiite belief, Hasan is considered to be the second imam, assigned by Ali himself and the fourth of fourteen "masum-i pak" (clean and pure) and the Shiites attribute many miracles to him However, some Shiite communities oppose him and criticize him as he made a treaty with Muawiyah. Today, in countries where Shiites live, like Iran and Iraq, religious ceremonies are held for the death of Prophet Muhammad and Hasan on 29 Safar, but these ceremonies are not as splendid as the condolence ceremony held during the first eleven days of the month of Muharram for Hussein.
Hasan, as the grandson of Prophet Muhammad has been the subject matter of a great deal of literature; he is note-worthy as the elder son of Ali and Fatima and as a person who waived his right to the caliphate in order not to shed the blood of Muslims. It is observed that apart from Islamic historical sources and biographical works about him, there are also other separate works. In various parts of hadith works of both Bukhari and Muslim, there are many hadiths from Prophet Muhammad about Hasan and Hussein (Buhari, "Feza'ilu Ashabi an-Nabi", 18, 22; Muslim, "Feza'ilu ash-Shahaba", 32, 56, 58-61, 67). In both works, there is one section for Hasan and one section for Hussein, with Prophet Muhammad's words about them being included. In Tirmizi, there are sections called "Manaqibu al-Hasan" and "Manaqibu Ahl Bayti an-Nabi", and more than twenty hadiths were included in these sections.
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