Yes, there were sent five Istari to Middle-earth. Their names were Olorin (Gandalf), Curumo (Saruman), Aiwendil (Radagast), and the two Blue Wizards (
Ithryn Luin), named: Alatar and Pallando. These names are the names they had in Valinor and these are the only names which they had that are known to us for they had no names in the ME (at least not in the parts of ME of which the tales tell).
When they came to ME, Saruman went eastwards with Alatar and Pallando. Saruman returned and settled in Orthanc, Isengard. What has happened to the Blue Wizards is not known for sure, but in UT Christopher Tolkien writes the following:
Quote:
In a letter written in 1958my father said that he knew nothing clearly about 'the other two', since they were not concerned in the history of the North-west of Middle-earth.
'I think,' he wrote, 'they went as emissaries to distant regions, East and South, far out of Númenórean range: missionaries to "enemy-occupied" lands, as it were. What success they had I do not know; but I fear they failed, as Saruman did, though doubtless in different ways; and I suspect that they were founders or beginners of secret cults and "magic" traditions that outlasted the fall of Sauron.'
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Olorin was sent by Manwë and Varda
Curumo was sent by Aule
Aiwendil was sent by Yavanna
Alatar and Pallando were sent by Oromë (for he had the greatest knowledge of the Valar about the far distant realms)
Ithaeliel - Aiwendil is the Quenya name of Radagast (meaning 'lover of birds'). This was his name on Aman. I don't know his Sindarin-name in Middle-earth. I doubt if it mentioned somewhere.
greetings,
lathspell