Who were the four Khalifas?

The Four Khalifas

The initial four caliphs who took over after Muhammad are referred to as the Rashidun (rightly-guided) Caliphs. They include: Abu Bakr (circa 573–634; ruled from 632–634), Umar ibn al-Khattab (circa 583–644; ruled from 634–644), commonly recognized as Umar or Omar, Uthman ibn Affan (circa 573–656; ruled from ...), and Ali ibn Abi Talib (circa 600–661; ruled from ...).