This 18th-Century British Queen Turned King Arthur Into a P.R. Strategy, Drawing on Myth to Promote Her Dynasty's Claim to the Throne
In 1735, Caroline of Brandenburg-Ansbach commissioned a cottage called Merlin's Cave, which linked the German House of Hanover to both Britain’s ancient heritage and its future success
We haven't written up this one. Smithsonian has the full story — the link below goes straight to it.