In 1601, Oñate undertook a large expedition east to the Great Plains region of central North America. The expedition party included 130 Spanish soldiers and 12 Franciscan priests—similar to the expedition of the Spanish conquest of the Aztec Empire—and a retinue of 130 American Indian soldiers and servants. The expedition possessed 350 horses and mules. Oñate journeyed across the plains eastward from New Mexico in a renewed search for Quivira, the fabled "city of gold." As had the earlier Coronado Expedition in the 1540s, Oñate encountered Apaches in the Texas Panhandle region.