For those wishing to do more reading on what is known about
Saint Bartholomew, check out these websites...

Catholic Encyclopedia.
http://www.newadvent.org/cathen/02313c.htm
This source goes into the confusion of Bartholomew and Nathanael.

Bartholomew the Apostle presented by the Catholic Forum.
http://www.catholic-forum.com/saints/saintb11.htm