Boy, that there Wikkipedia sure is helpful:
In the fiction of J. R. R. Tolkien, the Blue Wizards (or the Ithryn Luin in Sindarin) are two mysterious Maiar of the Vala Oromë sent to the East who are commonly called Alatar and Pallando. They are only hinted at in The Lord of the Rings, where Saruman states that there are five Wizards.
For the full article:
https://en.wikipedia.org/wiki/Blue_Wizards
The Unfinished tales states the same thing in the Istari Chapter. But as you mentioned in the previous post, Pallando and Allatar were not part of the White Council and had very little dealings East of Rhun.
Has anyone read the History of the Hobbit? I bought the 70th edition of the Hobbit that contained the two volume History of the Hobbit but I haven't had time to read it yet. I am pretty certain, there is a great deal more of text and actual writings from J.R.R. Tolkien in those two volumes which would give more information about the White Council and other important events pertaining to the One Ring but not mentioned in the Hobbit.
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