The first organ, known as the hydraulis, was invented by the Greek engineer Ctesibius of Alexandria in the 3rd century BC. He designed an instrument that used water pressure to create a steady wind supply for a set of pipes. The hydraulis was popular in the arenas of the Roman Empire.
Ctesibius' invention paved the way for the development of the pipe organ, which has evolved over centuries and remains a staple in classical music today.
