SANATANA GOSVAMI, the elder brother of Srila Rupa Gosvami, was the seniormost among the six Gosvamis of Vrndavana. At Varanasi, Lord Caitanya Mahaprabhu instructed him in detail about the science of devotional service. Lord Caitanya sent Srila Sanatana Gosvami to Vrndavana and gave him a fourfold mission: to uncover the lost sites of Krsna's pastimes, to install Deities of the Lord and arrange for Their worship, to write books on Krsna consciousness, and to teach the rules of devotional life. Srila Sanatana Gosvami, along with Srila Rupa Gosvami, fulfilled all four parts of this mission.
(See Sri Caitanya-caritamrta, Adi-lila 10.84, Madhya-lila 1.35, Madhya-lila chapters 20-24, and Antya-lila chapter 4.)