Those Caliphs who truly followed in the Prophet's foot steps are called 'The Rightly-Guided Caliphs'.
They are : Abu Bakr (ra), 'Umar (ra), Uthmân (ra) and Ali(ra).
All four were among the earliest and closest Companions of the Prophet (peace be on him). They
lived simple and righteous lives and strived hard for the religion of Allah Subhanahu Wa Tala.
With the death of Ali (ra), the first and most notable phase in the history of Muslim people came to
an end. All through this period it had been the Book of Allah and the practices of His Messenger - that is, the Qur'an and the Sunnah - which had guided the leaders and the led, set the standards of their moral conduct and inspired their actions. It was the time when the ruler and the ruled, the rich and the poor, the powerful and the weak, were uniformly subject to the Divine Law.
It was an epoch of freedom and equality, of God-consciousness and humility, of social justice which recognized no privileges, and of an impartial law which accepted no pressure groups or vested interests.
1 - The life of Abu Bakr (ra) - Murtaza Khan
2 - The life of Umar (ra) - Ahsan Hanif
3- The life of Uthman (ra) - Abu Usamah At-Thahabi
4- The life of Ali (ra) - Ismaeel Yousaf