Is it true that Galileo invented pendulum clocks?

No, it is not true that Galileo invented pendulum clocks. While Galileo Galilei studied the motion of pendulums and discovered the idea that a pendulum's period is constant regardless of amplitude, he did not actually build a pendulum clock.

The first pendulum clock was invented by Dutch scientist Christiaan Huygens in 1656, building upon Galileo's principles. Huygens used a pendulum to achieve remarkable accuracy in timekeeping, revolutionizing the field of horology.