By this time more detailed accounts of the importance of the conquest of Hernán Cortés began to be received, and on December 20, 1527, Zumárraga was recommended by Charles V for the post of first bishop of Mexico.
Do tog vremena počeli su stizati detaljniji zapisi o važnosti osvajanja Hernána Cortésa, a 20. prosinca 1527., Zumarragu je Karlo V. preporučio za mjesto prvog biskupa Meksika.