structural:reformatting
Al-Sīra al-Nabawiyya, commonly shortened to Sīrah and translated as prophetic biography, are the traditional Muslim biographies of the Islamic prophet Muhammad from which, in addition to the Quran and Hadiths, most historical information about his life and the early period of Islam is derived. The most striking issue about the life of Muhammad and early Islamic history is that the source information emerged as the irregular products of the storytelling culture and the increasing progress of the details over the centuries. Lawrence Conrad examines the biography books written in the early post-oral period and sees that a time period of 85 years is exhibited in these works regarding the date of Muhammad's birth. Conrad defines this as "the fluidity is still continuing" in the story.