I came accross a book several years ago (I eventually bought it from Amzaon.com)called "The Cross and the Pear Tree: a Jewish Journey". It talks a little about a Baron d'Aguilar, part of the Sephardite families related to Pereira. Unfortunately right now I am lecturing at Princeton and I cannot give you the details right away. However, I am going home to Costa Rica(where I have the book and other genealogical stuff) at the end of the week to attend precisely the 5th Inter-American genealogical conference (Nov. 13/16). Please send me an e/mail to the address above and I'll reply giving more information.