In ancient India, besides Rama, what other history books were there in the Bhagavad-gita?

The most famous literary works in ancient India are Mahabharata and Ramayana. The former is 654.38+ million fu, and the latter is about 24,000 fu, which is a unique long poem in the ancient world. There are 18 articles in Mahabharata, the main content of which is the story of the house king and the house Wang Zhengduo's throne in Mahabharata family. After many tortuous struggles, the two sides finally had to fight 18 days.