Mary Stuart was Queen of Scotland between 1542 and 1567 and she was only 6 days old when she acceded to the throne. She spent her last 18 years in custody of Queen Elizabeth of England after which Mary was found guilty of plotting to assassinate Elizabeth in 1586 and executed. She was 44 at the time of her execution. Experts from the University of Dundee compiled all the available portraits of Mary Stuart to recreate a 3D image of what she would've looked like during her reign.