Changdev was a conceited sage who wanted to test Gyaneshwar. He sent him a blank sheet of paper. Gyaneshwar sent back 65 verses to him known as Changdev Pasashti. Deeply impressed Changdev became Gyaneshwar’s student.
Gyaneshwar ist the son of Vithalpant and Rukmini.
Read about Gyaneshwar here
Read Changdev Pasashti here