Possible Clues:

• Historic Muslim leader
• Cutting about a hard religious leader
• Leader who succeeded Muhammad
• Spiritual leader of Islam
• Old religious leader in church covers initial anger - it's glossed over
• ... check arresting a border leader
• Sultan's companion consuming a sauce
• Religious leader endlessly tranquil, if he speaks
• Spiritual leader lacking energy in chapel I roused
• Historically, the chief Muslim civil and religious ruler, regarded as the successor of Muhammad