Isvara Puri

Isvara Puri was a monk who was a disciple of Madhavendra Puri from the Brahma Madhva Sampradaya. He met Chaitanya at Gaya, India, whereupon Mahaprabhu requested Puri to be his guru. The latter agreed and accepted Mahaprabhu as his disciple several days later, initiating him into the Gopal-mantra.

Krishnadasa Kaviraja has described in Chaitanya Charitamrita that:

 
the first sprout of the desire tree of devotion was manifested in the person of
Shri Madhavendra Puri, and that that sprout developed into a sapling in the person of Shri Ishvar Puri.
Then, in the person of Shri Chaitanya Mahaprabhu, Who was also the gardener Himself,
that the sapling became the trunk of an enormous tree-the desire tree of devotion. - (C. C. Adi 9.10-11)