Royal Frankish Annals
The automatic water-clock made of brass, described in the 807 "Royal Frankish Annals," and had spherical decorations which would strike cymbals below to create a chiming sound for each hour. There were also twelve figurines of horsemen that would animate at the end of each hour. Harun al-Rashid is also reported to have offered the custody of the Holy places in Jerusalem to Charlemagne.