In our Islamic history, caliphs took power at a young age, and found themselves in front of the responsibility of managing a large state; Some of them carried out his mission to the fullest extent, and he was a man and ruler with full mind and maturity, advancing the affairs of the state with skill and power despite his young age. It agrees with their whims, tendencies and ambitions.And this book - dear reader - is not an arena for the trial of the caliphs who assumed the caliphate at an early age; Who did it right and who did it wrong, but he presented the biography of these caliphs, mentioning the features of their era, how they took power, the circumstances they faced and how they overcame them, and their dealings with crises in a state controlled by ministers and its enemies from all sides.