Eleanor de Montfort

Eleanor de Montfort, Princess of Wales and Lady of Snowdon was an English noblewoman and Welsh princess through her marriage to Llywelyn ap Gruffudd, who was Prince of Gwynedd, and later, Prince of Wales. She was the daughter of Simon de Montfort, 6th Earl of Leicester and Eleanor of England, Countess of Leicester. She was the second woman who can be shown to have used the title Princess of Wales.