|Centuries:||1st century BH – 1st century – 2nd century|
|Years:||3 BH 2 BH 1 BH – 1 AH – 2 AH 3 AH 4 AH|
Year 1 AH was 14 lunar years after the year of Bi'tha (beginning of prophet Muhammad's (s) mission). Year 1 AH started on Friday, July 16, 622 CE and ended on Monday, July 4, 623 CE in the Julian calendar.
In this year the Prophet Muhammad (s) and his followers migrated from Mecca to Yathrib which was later called Medinat al-Nabi (city of the Prophet). This migration led to foundation of the first Islamic community and later on was considered as the epoch of the Islamic calendar. The first mosque in Islam and also Masjid al-Nabi were built in this year.
- Rabi' I 1 – In Laylat al-Mabit, Imam 'Ali (a) slept in the bed of prophet Muhammad (s), because polytheists of Quraysh had plotted to assassinate the Prophet. (September 13, 622 CE)
- Rabi' I 1 – The Prophet (s) and a group of Muslims left Mecca and immigrated to Yathrib. (September 13, 622 CE)
- Rabi' I 15 – The Prophet (s) and his Companions Constructed Quba Mosque (September 27, 622 CE)
- Rabi' I – After migration, the prophet let Friday Prayer for his first time.
- Jumada I – Salman al-Farsi Converted to Islam. (November or December, 622 CE)
- Al-Masjid al-Nabawi was Constructed.
- Legislation of Adhan
- Pact of Brotherhood between Muhajirun and Ansar
- The first Sariyya in Islam
- The peace treaty between the Prophet (s) and Jews
- Marriage of the Prophet (s) with A'isha
- Shawwal – Abd Allah b. al-Zubayr (d. 73/692 CE), fought against Imam 'Ali (a) in the battle of Jamal and later on claimed the caliphate after the death of Mu'awiya, (April 623)
- Al-Mukhtar al-Thaqafi (d. Ramadan 14, 67/April 6, 687), the leader of an uprising to revenge Imam al-Husayn's (a) blood.
- Ziyad b. Abih (d. 53/673), the governor of Basra and Kufa in the time of Mu'awiya.
- Ṭabarī, Muḥammad b. Jarīr. Tārīkh al-umam wa l-mulūk. Cairo: Dār al-Ma'arif, 1968 CE.