URL：https://c8.alamy.com/comp/3CE4WP8/the-abbasid-caliphate-harun-al-rashid-r-786809-receiving-a-delegation-sent-by-charlemagne-at-his-court-in-baghdad-painting-by-julius-kckert-18271918-oil-on-canvas-1864-3CE4WP8.jpg
掲載元：https://www.alamy.com/stock-photo/caliphate-of-al-mustali-or-alamir.html
