The two mythical giants Otus and Ephialtes are the sons of Aloeus and Iphimedea. The Aloadae were renowned for their strength and daring. When they were only nine years old they were each 54 feet tall. They wished to wage war on the Olympian gods and they tried to pile Mt. Ossa upon Mt. Pelion upon Mt. Olympus. However, before they could do so, the brothers were slain by Apollo's arrows. According to some myths, they were friendly towards humanity and expanded civilization and were thought to be the founders of several cities.