Radagast the Brown

Radagast (Adûnaic; IPA: ['radagast] - "Tender Of Beasts") the Brown was one of the Wizards, or Istari, sent to Middle-earth to contest the will of Sauron. Originally a Maia of Yavanna, Radagast was mainly concerned with the well-being of the plant and animal worlds, and thus did not participate heavily in the War of the Ring.
Originally called Aiwendil, Radagst was a Maia created from before Time who descended to Arda in order to serve the Valar. Aiwendil was a servant of the Valië Yavanna, the Queen of earth.

After the Undying Lands were separated from Arda during the Downfall of Númenor, Manwë was still concerned for the fate of the peoples of Middle-earth, because though Sauron was overthrown, it would later turn out that he had not been effectively vanquished and his shadow began to fall a second time. A council of the Valar was summoned and it was decided that they would send emissaries to Middle-earth, these should be "mighty peers of Sauron, yet forgo might, and clothe themselves in flesh," as they were intended to help Men and Elves unite against Sauron, but the wizards were forbidden from matching the Dark Lord in power and fear. Aulë chose Curumo, Oromë chose Alatar and Pallando, and Manwë chose Olórin. Yavanna subsequently begged Curumo to take Aiwendil with him.