Juan de Ulibarrí or Uribarrí (1670-1716) was a Spanish or Criollo soldier and explorer who lived in New Mexico. In 1706 he led an expedition to El Cuartelejo on the Great Plains of western Kansas and eastern Colorado. Ulibarrí's diary survives and is an important source for the history of Spanish exploration of the Great Plains and relationships with the Apache and Pueblo Indians. The purpose of Ulibarrí's expedition was to find and escort back to New Mexico about 60 people from Picuris Pueblo who had earlier fled Spanish rule in New Mexico and established communities on the Great Plains. The Cuartelejo Ruins in Kansas are a remnant of the Pueblos who lived on the plains.