This Book Is Releated To The Life Of 4 caliphs Of Islam. The Rashidun Caliphs (Arabic: الخلفاء الراشدون, romanized: al-Khulafāʾ al-Rāshidūn, lit. 'Rightly Guided Caliphs'), often simply called the Rashidun, are the first four caliphs (lit.: 'successors') who led the Muslim community following the death of the Islamic prophet Muhammad: Abu Bakr ( r. 632–634), Umar ( r.a), Usmaan (r.a) Ali (r.a)