What was special about Kalhaṇa's Rājatarangiṇī?

Rājatarangiṇī means 'River of Kings' and was written by scholar-poet Kalhaṇa in the 12th century. It narrates the history of Kashmir's dynasties from the beginning to his time. Kalhaṇa used inscriptions, temple records, and earlier works to write accurate history. He believed historians should remain unbiased when relating facts.