In the dead of winter 1142, an empress besieged at Oxford Castle wraps herself in white to vanish against the snow, slips through a secret back gate past enemy sentries, and escapes on foot across the cracking ice of a frozen river. It's the perfect distillation of Empress Matilda.

This deep dive explores a woman whose sheer will forever altered the course of history. From a child shipped across Europe to rule an empire to a brutal civil war for the English throne known as the Anarchy, Matilda's life is a master class in how power is seized, lost, and redefined when royal succession breaks down. It matters because her story exposes how history judges ambitious women differently from ambitious men.

• Betrothed at eight to a Holy Roman Emperor and acting as imperial regent in Italy while still a teenager
• The White Ship Disast ...