| Umm Isa bint Musa al-Hadi أم عيسى بنت موسى الهادي | |
| Succession: | Consort of the Abbasid caliph |
| Zawjat al khalifa | |
| Predecessor: | Lubana bint Ali ibn al-Mahdi |
| Successor: | Khadija bint al-Hasan ibn Sahl |
| Spouse: | Al-Ma'mun |
| Issue: |
|
| Issue-Type: | Children |
| Birth Date: | c. 783/85 |
| Birth Place: | Baghdad or Haditha, Abbasid Caliphate |
| Death Date: | 830s |
| Death Place: | Baghdad, Abbasid Caliphate |
| Place Of Burial: | Baghdad |
| Dynasty: | Abbasid |
| Father: | Musa al-Hadi |
| Religion: | Islam |
Umm ʿĪsā bint Mūsā al-Hādī (Arabic: أم عيسى بنت موسى الهادي) was an Abbasid dynasty princess, daughter of caliph al-Hadi, niece of caliph Harun al-Rashid and principal wife of al-Ma'mun, the seventh caliph of the Abbasid Caliphate.
Umm Isa was the daughter of Al-Hadi from one of his concubines. She was born around 783 or 785. She spend her childhood in Baghdad. She was a young child when her father died in 786. Her father was succeeded by her uncle Harun al-Rashid. Her uncle took care of her and her brothers after al-Hadi's death.
Al-Ma'mun married his first wife Umm Isa, the daughter of his uncle al-Hadi, whom he married when he was eighteen years old. They had two sons, Muhammad al-Asghar, and Abd Allah.This marriage was arranged during Harun al-Rashid's reign. Also, The two sons of al-Hadi, Isma'il and Ja'far married Harun-Rashid's daughters, Hamdunah and Fatimah respectively. Thus, the two daughters of Harun were also cousins and sister-in-laws of Umm Isa. She lived a secluded life in the Caliph's harem, only a few things is known about her.
Umm Isa was one or two years older than her husband al-Ma'mun. Her husband was born on the same day when her father died and her uncle ascended to the Caliphate.
Her uncle, caliph Harun al-Rashid had nominated his two elder sons Al-Amin and al-Ma'mun as heir. Already in 792, Harun had Muhammad receive the oath of allegiance (bay'ah) with the name of al-Amin ("The Trustworthy"), effectively marking him out as his main heir, while Abd Allah was not named second heir, under the name al-Maʾmūn ("The Trusted One") until 799. Her husband al-Ma'mun became caliph after the death of her cousin and brother-in-law al-Amin. In 813, al-Amin was beheaded, and al-Maʾmūn became the undisputed Caliph.[1]
Umm Isa was related to the Abbasid ruling House paternally. She was contemporary to several Abbasid caliphs, Abbasid prince and Princesses.
| No. | Abbasids | Relation |
|---|---|---|
| 1 | Musa al-Hadi | Father |
| 2 | Harun al-Rashid | Uncle and Father-in-law |
| 3 | Al-Amin | Cousin and Brother-in-law |
| 4 | Al-Ma'mun | Husband |
| 5 | Muhammad al-Asghar | Elder son |
| 6 | Abdallah ibn al-Ma'mun | Second son |
| 7 | Hamdunah bint Harun al-Rashid | Sister-in-law |
| 8 | Fatimah bint Harun al-Rashid | Sister-in-law |
| 9 | Jafar ibn Musa al-Hadi | Brother |
| 10 | Al-Abbas ibn Musa al-Hadi | Brother |
| 11 | Abdallah ibn Musa al-Hadi | Brother |
| 12 | Ishaq ibn Musa al-Hadi | Brother |
| 13 | Isma'il ibn Musa al-Hadi | Brother |
| 14 | Sulayman ibn Musa al-Hadi | Brother |
| 15 | Musa ibn Musa al-Hadi | Brother |
| 16 | Umm al-Abbas bint Musa al-Hadi | Sister |