Title: al- Khulafāʾ al-Rāshidūn
Subjects: History
Places: Islamic Empire
People: ʻUmar ibn al-Khaṭṭāb Caliph (d. 644), ʻAlī ibn Abī Ṭālib Caliph (600 (ca.)-661), Abū Bakr Caliph (d. 634), ʻUthmān ibn ʻAffān Caliph (d. 656)
Time periods: 622-661