 On July 29, 1776, Atanasio Domínguez led the expedition from Santa Fe with fellow friar Silvestre Vélez de Escalante and cartographer Bernardo de Miera y Pacheco (Miera).The initial part of their journey followed the route taken by Juan Rivera eleven years earlier into the Ute country of southwestern Colorado.Three Timpanogos guides led them through Colorado and Utah.