Potatoes predate the ruins anyway. The origins of the potato, Solanum tuberosum, can be traced to the Andes highlands, on the border between present-day Bolivia and Peru, almost eight thousand years ago. According to legend, when the mythical founders of the Inca Empire, Manco Cápac and Mama Ocllo, emerged from the waters of Lake Titicaca, the sun god Viracocha taught them how to sow potatoes. Early hunter-gatherer communities began by domesticating wild plants that grew abundantly around Lake Titicaca. Beyond Cuzco, in the sacred valley of Urubamba, pre-Colombian farmers cultivated other crops—tomatoes, beans, and corn—but the potato proved most suited to the quechua (valley) zones; growers eventually developed frost-resistant species that thrived on alpine tundra as well.