In the mist-shrouded dawn of October 17, 1173, near the quiet Suffolk village of Fornham St. Genevieve, history was about to witness something remarkable. Not just another medieval battle between king and rebels, but the extraordinary tale of a countess who donned armor, took up lance and shield, and rode into battle alongside her husband against the Crown itself.

This is the story of Petronilla de Grandmesnil, Countess of Leicester – a woman whose courage would echo through the centuries, and whose fall into a muddy ditch would become one of the most memorable moments of medieval English warfare.