The Hecatoncheires are mythical giants from Greek mythology, known for having one hundred arms and fifty heads. They are the offspring of the primordial deities Uranus (the sky) and Gaia (the earth). The three most famous Hecatoncheires are Cottus, Briareus, and Gyes. These giants played a significant role in the Titanomachy, the war between the Titans and the Olympian gods. The Hecatoncheires sided with the Olympians, using their immense strength and numerous arms to help defeat the Titans, ultimately securing the victory for the gods and establishing their rule over the cosmos.