Umm Kulthum bint Ali
Umm Kulthum bint Ali (Arabic: أم كلثوم بنت علي) (birth : Wednesday, 18 Rabi' ul-Awwal, 9 A.H/ July 6, 630 A.D (Gregory Calendar) was the fourth child of Ali ibn Abu Talib (the fourth Rightly Guided Caliph and first Shi’a Imam) and Fatima, the daughter of Muhammad.She is also known as “Zainab the Junior".
Umm Kulthūm bint Ali was the fourth child and second daughter of ‘Ali and Fatima. She was also the granddaughter of Muhammad and sister of Imam Hussein and Imam Hassan. She also survived during the battle of Kerbala.
Recognizing the marriage
according to Quran And do not marry women whom your fathers married except what has already passed. It was indeed obscene, hateful and an evil way. (22) Forbidden to you in marriage are: your mothers, your daughters, your sisters, your father's sisters, your mother's sisters, your brother's sisters, your sister's daughters, your wet nurse, your 'sisters' by nursing, your wives mothers, your step daughters under your guardianship born of your wives with whom you have consummated - if you did not consummate then there is no sin upon you, the wives of your blood sons, two sisters at the same time, except for that which has already passed. Verily, Allah is Forgiving, Merciful. (23) And those already married except those whom your right hand possesses (through capture). Allah's ordinance upon you. And allowed for you are all besides these if you seek them with your property seeking chastity not fornication..." [Noble Quran 4:22-24] The marriage issue of Umme Kulsum to Umar ibn khattab is absurd, and is propagated to show the righteousness of Umar ibn khattab. Bibi Umme Kulsum was like grand daughter of Umar ibn khattab as his daughter Hafsa was wife of prophet Mohammed then how could caliph Umar commit a forbidden act by marrying his own Son in laws grand daughter. The age of Umme Kulsum at the time of death of Umar ibn Khattab was 14 years, why would Hazrat Ali marry his daughter to a person of her grand fathers age. He could have married Umme Kulsum binte Abu bakr which is possible based on Islam and closeness of Umar with Abu bakr. Umme Kulsum was married to Awn Ibn Jaffer e tayyar A.S. and was widow at the time of incidence of karbala.
Sources of marriage
It was not possible to ascertain who had died first. They did not inherit from one another and their funeral prayers were read at the same time.
Umm Kulthum is buried in Baab Sagheer cemetery in Damascus, Syria. The Fatimid/Dawoodi Bohra believe that the Mausoleum at Damascus named as of Zaynab-ul-Kubra is of Umm Kulthum (may be confusion in 'Sugra' or 'Kubra') and the mausoleum of the elder daughter of Ali, Zaynab bint Ali, is in Cairo.
Comments from History on Mausoleum
The following history quote mentioned in media/web (The Heroine Of Kerbela: A Visit To The Mosques Of Sayeeda Zainab In Egypt and Syria, by Moushira El-Fishawy also indicates that the Mausoleum of Umm-Kulthum is located in Arrawiya village in Damascus, which is the same place as present Zaynabia: “Sayeeda Zainab was born in the 6th year of Hegira in the house of the Prophet in Medina ….“Zainab the Senior”, to distinguish her from “Zainab the Middle One”, her sister born in year 9 of Hegira (named “Um Kaltoum”, after her aunt), … “Zainab the Junior, whose mausoleum is in Arrawiya village in Damascus, according to Ibn Al Hourani, in his work “Places of Visits” and al-Mousili, in his book “Al Ma’aref” (Knowledge).”
- Al-Maarif, by Ibn Qutaybah, page 77, Chapter "Dhikr Umar" 
- Al-Istiab, Volume 4, page 492
- Asad al-Ghaybah fi Marifathul Sahaba, Volume 5, page 367
- Tareekh Baghdad, Volume 6, page 182
- Tareekh Khamees, Volume 2, page 384, Dhikr Umm Kalthum
- Tabaqat ibn Sa'd, Volume 8, page 463, Dhikr Umm Kalthum
- Sawaiqh al-Muhriqa, page 94
- Zakhair al-Akba, pages 168 and 169
- Asaaf al-Ghaneen, page 162
- Al-Isaba, Volume 4, page 321
- Furu' al-Kafi, vol. 6, p. 117, Dar al-Adwa, Beirut 1992
- 'Tahdeeb al-Ahkam Vol.2, p.380 in Chapter “Meeras (inheritance)”'