Almirante (Admiral) Juan Esteban De Ubilla

I am reading in the PARS website about the viaje to Mexico en 1712 by Juan Olivan De Rebolledo. I was interested in this word "Admirante" which then later found out it means "Admiral"

http://oi62.tinypic.com/6z4jyu.jpg

I found it in the pars website: http://www.archivesportaleurope.net/search/-/s/n

Reference: CONTRATACION,5466,N.2,R.30

Pg 11

I think the Admiral is Juan De Esteban De Ubilla. I looked him up which led me to this enlace:

http://censoarchivos.mcu.es/CensoGuia/fondoDetail.htm?archivoId=10&id=974481&eventDescendiente=descendienteDetail