Dunstanburgh Castle, a huge and jagged ruin on the Northumberland coast, was almost entirely the creation of one man – Thomas, Earl of Lancaster. Little known today, he was immensely wealthy, powerful and controversial. He fell out with rivals, supporters and family, was executed for treason, and nearly made a posthumous saint. We’re joined by Head Historic Properties Curator Dr Jeremy Ashbee to discover the story of Dunstanburgh and what its landscape and buildings can tell us about Thomas's extraordinary career.

For more details about Dunstanburgh Castle or to plan a visit, go to www.english-heritage.org.uk/dunstanburgh