Wadaich
Prime Minister (20k+ posts)
Baghdad Clock in Aachen: Harun-al-Rashid’s Gift to Charlemagne
Along with an elephant whose name in Arabic meant “the father of intelligence,” Abbasid caliph Harun al-Rashid presented Holy Roman emperor Charlemagne with a mechanical clock powered by water in 807. At noon a weight dropped, bells sounded, and twelve brass horsemen emerged from twelve windows.
https://muslimheritage.com/baghdad-clock/#baghdad