Lady Jane Grey...

From the Guardian:

Queen of England for nine days, then dispatched by the axeman at the Tower of London at the age of just 17, Lady Jane Grey and her tragic story have exerted a deep fascination for centuries. She is the only English monarch since 1500 of whom no portrait survives. Or so it has long been assumed.
But experts are now claiming that a painting that hung for years in a house in Streatham, south-west London, is of Lady Jane. The owner inherited the work from his great-grandfather, a collector of 16th-century antiques.

Fascinating...