No, 'The Warrior Queen' isn't based on a true story. It's a work of imagination that weaves a story within a historical-like framework, but it doesn't adhere to a factual occurrence.
The Warrior Queen of Jhansi, Rani Lakshmibai, was a remarkable figure. She fought against the British during the Indian Rebellion of 1857. She showed great courage in leading her troops and defending her kingdom. She was a symbol of resistance and is remembered for her fearless attitude towards the colonial powers.
I'm not sure which apocalyptic novel you're referring to, but teachers in apocalyptic novels usually have many roles such as teacher, mentor, consultant, instructor, and so on. The character of the Bloodthirsty Queen usually appeared in some well-known apocalyptic novels or anime. She could be a teacher, mentor, or consultant, but she could also be a specific character or a fictional character.
Martial Saint Guan Yu had undergone a bone scraping treatment in Romance of the Three Kingdoms. Guan Yu was shot in the right arm by Cao Cao's army when they attacked Fancheng. The arrow was poisoned. In order to treat this wound, Guan Yu had invited Hua Tuo, the godly doctor. Hua Tuo suggested to scrape the wound and remove the poison. Although the process was very painful, Guan Yu showed strong willpower and courage. He played chess with Ma Liang while receiving treatment without changing his expression. This story displayed Guan Yu's heroic and tenacious image, and became a classic story praised by later generations.
I'm not sure specifically as I haven't read this exact novel. But generally, it might be about a warrior who is exiled perhaps due to jealousy or some political intrigue involving the hero and his lover. Maybe the hero feels threatened by the warrior in some way related to his relationship with his lover.
Well, it seems the warrior had some sort of conflict with the hero and his lover. Maybe he knew a secret that could expose them, and that's why they got rid of him.