The Kolhapur police have filed a case against a man for allegedly threatening historian Indrajeet Sawant and making derogatory comments against Chhatrapati Shivaji Maharaj and his son Sambhaji Maharaj, officials said on Wednesday, PTI reported.

As per PTI, Sawant, who lives in Kolhapur city in Maharashtra, got a call in the wee hours of Tuesday wherein the caller identified himself as 'Prashant Koratkar' and threatened to kill him for allegedly trying to spread hatred against the Brahmin community, an official said.