John Guy, Kate Williams and Robert Hutchinson are among those debating the legacy of one of Britain's most tragic monarchs as they examine whether Mary, Queen of Scots, was a victim of her cousin Elizabeth I's treachery or the author of her own destruction. They look at her claim to the English throne and the events that led to Mary being kept under house arrest for nearly 20 years before she was executed in 1587.

• Jamie Laird