Answer : 3. "Amish Tripathi"
Explanation :

The book begins with Mahmud of Ghazni’s invasion and the massacre of the holy Somnath Temple. This book has documented the adventure of the warrior-king Suheldev. The way Suheldev brings together people from various faiths. Legend of Suheldev is the story of a king who united men and women of the nation, irrespective of their religion, caste, region, or status in society.