It's fictional. 'The Empress' is crafted by writers to present an engaging narrative, not based on real events or people. The plot and characters are imagined to captivate the audience.
Well, the empress is bound to be a central character. Then, depending on the nature of the story, there could be her political allies, those who help her ascend the throne or maintain her rule. There might also be her enemies, whether they are from within her own court or from rival empires. Additionally, if the series delves into her personal life, there could be childhood friends or mentors who shape her character.
Empress is not directly based on a true story. It likely takes inspiration from various sources and weaves them into a fictional narrative to captivate the audience.