Johann Ludwig Burckhardt was a Swiss traveller, geographer, and Orientalist. Burckhardt assumed the alias Sheikh Ibrahim Ibn Abdallah during his travels in Arabia. He wrote his letters in French and signed Louis. He is best known for rediscovering two of the world's most famous examples of rock-cut architecture – the ruins of the ancient Nabataean city of Petra in Jordan and the temples of Abu Simbel in Egypt.