structural:scholar_edition, linguistic:translation, quality:correction
Assessment and legacy

Though the period of his caliphate covers only two years, two months and fifteen days, it included successful invasions of the two most powerful empires of the time: the Sassanid Empire and Byzantine Empire. He is known as Al-Siddiq, Atiq and Companion of the Cave.

Abu Bakr had the distinction of being the first Caliph in the history of Islam and also the first Caliph to nominate a successor. He was the only Caliph in the history of Islam who refunded to the state treasury at the time of his death the entire amount of the allowance that he had drawn during the period of his caliphate. He has the distinction of purchasing the land for Al-Masjid al-Nabawi.