There are a number of uncertainties and disputed issues in the early Islamic history.

Introduction

Most of these disputes can be traced to Shi'a-Sunni disagreements. Shi'a often argue that history has been distorted to further a Banu Umayyad agenda. In many cases, complications with the historiography of early Islam

Historiography of early Islam

The historiography of early Islam refers to the study of the early origins of Islam based on a critical analysis, evaluation, and examination of authentic primary source materials and the organization of these sources into a narative timeline....

 have also resulted in lack of consensus within denominations of Islam.

List

Some of them include:

• The date of birth of Muhammad
  Muhammad
  Muhammad |ligature]] at U+FDF4 ;Arabic pronunciation varies regionally; the first vowel ranges from ~~; the second and the last vowel: ~~~. There are dialects which have no stress. In Egypt, it is pronounced not in religious contexts...
  
  
• The date of Muhammad's death
• The age at which Khadija married Muhammad (25–40 years)
• The date of birth of Fatimah
  Fatimah
  Fatimah was a daughter of the Islamic prophet Muhammad from his first wife Khadijah bint Khuwaylid. She is regarded by Muslims as an exemplar for men and women. She remained at her father's side through the difficulties suffered by him at the hands of the Quraysh of Mecca...
  
   (±10 years)
• The marriage in which three of Khadijas three daughters where born in, see Genealogy of Khadijas daughters.
• The number of marriages Khadija was in before marrying Muhammad (0-2 marriages).
• The year of the prohibition of Nikah Mut'ah.
• Date of birth of Aisha
  Aisha
  Aisha bint Abu Bakr also transcribed as was Muhammad's favorite wife...
  
   (6–14 years).
• Identity of the second wife of Muhammad (Sawda or Aish'a)
• Disputes over the identity of the "Umm Khulthum" that married Umar
  Umar's marriage to Umm Kulthum
  Umar's marriage to Umm Kulthum bint Ali occurred in , when Umar was 55 years old. The event is notable in that Shi'a and Sunni differ as to the identity of the person named Umm Kulthum.-Overview:...
  
   (bint Ali, Bint Abu Bakr or a third).
• The existence of Fatimahs third son, Muhsin ibn Ali
  Muhsin ibn Ali
  Al Muhsin or Mohsin, in Shi'a belief, was the unborn child of Fatima Al Zahra, the daughter of the Islamic prophet Muhammad and wife of Ali ibn Abu Talib. She miscarried after being crushed behind a door by Umar and his men who had come to threaten her husband...
  
  .
• The nomination of Ali Ibne Abi Talib as first caliph by Muhammad in Ghadeer e Khum & Dawat ZulAsheera (first invitation of Islam by Prophet Mohammad to his close relatives)
• Prophet's Inheritance & The dispute on the Land of Fadak & Khyber.
• Disputes over Uthman bin Affan being Zun Nurain.

External articels

• Early Troubles in Muslim History, Shia Articles.shiabook.blogspot.