|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 is the first year in Lunar Hijri calendar. This year was 13 lunar years after Bi'tha of the holy Prophet (s) (beginning of prophet's (s) mission) and 53 lunar years after 'Am al-Fil. Year 1 AH approximately started on Friday, July 16, 622 CE and ended on Monday, July 4, 623 CE.
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 starting point of the Islamic calendar. The first mosque in Islam and also Masjid al-Nabi were built in this year.
- Safar 29 - Conspiracy of the leaders of Quraysh to assassinate the Prophet (s) (September 15, 622)
- Rabi' I 1 - The event of Laylat al-Mabit (September 16, 622)
- Hijra of the Prophet (s) and a group of Muslims from Mecca to Medina
- Rabi' I 12 - Legislation of Prayer as a daily duty for Muslims (September 27, 622)
- Rabi' I 15 - Beginning of the construction of Quba Mosque (September 30, 622)
- Conversion of Salman to Islam
- Conversion of 'Abd Allah b. Salam
- The first Friday Prayer and the Khutba
- Construction of Masjid al-Nabi
- Performing the first Mayyit Prayer
- 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.
- As'ad b. Zurara, a companion of the prophet (s) and among the first people of Yathrib who converted to Islam.