Juan de Oñate was a Spanish explorer and conquistador who played a significant role in the Spanish colonization of New Mexico during the late 16th century. He is best known for leading an expedition that established the first permanent European settlement in the region at San Juan Pueblo and for founding the colony of New Mexico, which marked the beginning of Spanish influence in the area. His actions were pivotal during the Spanish colonial period, as they set the stage for mission establishment and settlement patterns in New Mexico.