First of all Madhavdev by Satyendra Sharma is a biography of Mahadev one of the preceptor of Ekasarana Dharma. Basically who contributed his entire life for the upliftment of Assamese culture. Furthermore Madhavdev and Shankardev were two personalities who were quite popular in sixteenth century and known for their loyalty towards their Gurus.
Shankardev was guru of Mahadev who provided his teachings to him as well as make him his heir. These two are known in ever household in the state of Assam in India and are being considered as one of the incarnation of God. He is known particularly for his book of hymns, the Naam Ghoxa, as well as a large selection of songs called Borgeets.