Quick question

[Pallando B.C]

There were six Istari: Gandalf, Saruman, Radagast, and the three Blue Wizards

The Istari were only made up of five, which means that there were only two Blue Wizards; Pallando and Alatar.

Pallando and Alatar were servants (while on Valinor) of the Vala Oromë, who knew most of the Eastern Lands. It is said that that is where the Blue Wizards went.