Rajtarangini, authored by Kalhan, describes, the history of :

Rajatarangini, which translates to 'The River of Kings', is a metrical historical chronicle written in Sanskrit by the Kashmiri Brahman Kalhana in 1148-49 CE. The work is widely regarded as the first authentic historical text of ancient India because of its chronological narrative and use of diverse sources like royal chronicles, inscriptions, and the Nilamatapurana [1]. It specifically details the dynastic history of Kashmir, covering approximately four millennia of its past across eight books known as Tarangas. Kalhana's work is unique for its geographical awareness and its attempt to provide a critical record of the kings of the north-western Indian subcontinent, particularly focusing on the rich valley of Kashmir. It remains a primary source for reconstructing the political and social history of the region during the medieval period.

Sources

1. [1] https://archive.org/download/kalhana-and-history-historical-issues-to_202006/Kalhana_and_History_Historical_Issues_to.pdf