By Mark Duell for MailOnline
Published: 10:19 GMT, 25 March 2019 | Updated: 10:40 GMT, 25 March 2019
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Jason Kingsley from Oxford dresses up as a knight to demonstrate jousting and weapons
From Monday to Friday, he is a millionaire computer games boss whose company is behind the likes of Aliens vs Predator, Sniper Elite and Judge Dredd.
But at the weekends, Jason Kingsley from Oxford goes back in time to the medieval age by dressing up as a knight to demonstrate jousting and weapons.
And the 54-year-old developer's videos have proven to be an unlikely hit on YouTube, gaining more views in a month than the celebrity vlogger Zoella.
Mr Kingsley, whose partner is descended from Japanese samurai, owns 15 horses and four suits of armour plus weapons from poleaxes to longbows on his farm.
He said producing the videos for his Modern History TV channel helps him unwind -
