Findings:
- al-Ma'mun
- Caliph
- The Adventures of Haroun-al-Raschid, Caliph of Bagdad
- Umayyad Caliphate
- Four Righteous Caliphs (node_forward)
If you Log in you could create a "Caliph al-Ma'mun" node. If you don't already have an account, you can register here.