Giles was the first European to see the rock formations named The Olgas, now officially known by Kata Tjuta/Mount Olga, and Lake Amadeus. He had wanted to name these Mt Mueller and Lake Ferdinand respectively, to honour his benefactor Baron Ferdinand von Mueller, however Mueller prevailed on him to instead honour the King Amadeus of Spain and Queen Olga of Württemberg. Giles supposedly discovered Uluru (also known as Ayers Rock), but was beaten to the claim by a competing explorer, William Gosse.