Who was Shri Saraswati Gangadhar, and what details does the preface offer about his biography?

The preface provides important context about Shri Saraswati Gangadhar's lineage and work. According to Chapter 0, his surname was Sakhare, and he was the fifth descendant of Shri Sayandev. This ancestor, Shri Sayandev, had received the grace of Shri Narsimha Saraswati Maharaj and was given a boon that his descendants would perform constant service. This positions Shri Saraswati Gangadhar within a blessed lineage. His work, the "Brihad Guru Charitra," is distinguished from the "Laghu Guru Charitra" from Wadi. The preface also implicitly establishes the significance of his biography by stating that the one written by Shri Samarth Sadguru Vasudevanand Saraswati Maharaj had not become as famous, highlighting the prominence of Gangadhar's contribution.