Caliphs 5 Islam 3 History -- 2 Caliphs -- 1 Camel, Battle of the, Iraq, 656 1 Juvenille literature 1 Opposition (Political science) -- 1 more ... Political parties -- 1 Religious aspects -- 1 Siffin, Battle of, Syria, 657 1 Spouses of heads of state -- 1 Women in Islam 1 less ...