Key Places Aberlleiniog: The Ultimate Hidden Gem Counting comments... Pirates, plunder and poison -- discover a "secret" castle with 900 years of fascinating stories to tell. Beaumaris Castle: Military Masterpiece Counting comments... In 1295 Edward I of England ordered work to begin on the last - and most well designed - of his five castles, a perfectly shaped fortress on the "beautiful marsh": Beaumaris. Llys Rhosyr: The One and Only Welsh Court Counting comments... Where Llywelyn Fawr once rallied soldiers, collected taxes, hosted fetes, hatched plans, and danced with his wife . . . .