Synopsis Islam is one of the major religions of the world and perhaps, there is hardly any corner of the world, where Muslims are not found. Culturally, geographically or socially, there may  exist some differences among them, but their faith in the oneness of Allah, makes them one nation or people, spread all over the world. History of Islam is a vast subject. It requires lacs of pages to record it at length. It  was really a challenge to cover various phases and periods of Islamic history in a comprehensive manner, in separate books. The undersigned took  up this challenge and the result is this series of books. Islam as a faith and ideology, has found mention in millions of books, dealing with various subjects, under Islamic history. Still, need was felt to bring out a comprehensive books, in a series, encapsulation all in its covers.

Present work, namely, Great Companions, a small but exhaustive one, is an effort in the direction of recording the history of Islam, authentically. It must prove to be valuable for all scholars and general readers.