He visited Earth in the distant past, and was instrumental in the technological and architectural advances of the Egyptian, Mayan, and Aztec civilizations. He also taught them new art and agriculture techniques. He hoped that they would combine this knowledge to complete Kukulkan's city and live in peace. They did not. Kukulkan's visit to Earth is manifested in history by legends of a winged serpent creature that came from the sky bringing knowledge. These records were available in the library computer.