Must be Alien Chronicles: The Golden One
Ampris thought her gladiator days were behind her until she discovered the truth behind the enslavement of the Aarouns under the Viis--causing her to take up arms against tyranny one final time.
A series of Sci-Fi books by Deborah Chester, published by Lucas Film, that tells the tale of how a single slave, Ampris, leads an uprising against the reptilian Viis, whose cruel empire is undergoing a Götterdämmerung, and becomes a legend. It read largely like a cross between the Book of Exodus and the story of Spartacus, the slave-gladiator who attempted to bring down the Roman Empire
Found in reddit