The first mechanical clock invented was in China during the 8th century A.D. The first mechanical clocks in Europe began to appear in the early 14th century.
A Buddhist monk named Yi Xing made the first mechanical clock model in 725 A.D. Yi Xing made the clock to assist him in the creation of a calendar. Dripping water powered a wheel inside the clock, and a bell chimed each hour.
The earliest clocks in Europe were large and weight-driven, and built into towers. The Dutch scientist Christiaan Huygens developed the use of the pendulum in clocks during the 17th century.