The grim, majestic mass of Caernarfon Castle, a UNESCO World Heritage Site, looms over the waters of the River Seiont. Numerous bloody encounters were witnessed by these sullen walls, erected by Edward I in 1283 as a symbol of his determination to subdue the Welsh. The castle's towers, unlike those of Edward I's other castles, are polygonal and patterned with bands of different-color stone. In 1284 the monarch thought of a scheme to steal the Welsh throne. Knowing that the Welsh chieftains would accept no foreign prince, Edward promised to designate a ruler who could speak no word of English. Edward presented his infant son to the assembled chieftains as their prince "who spoke no English, had been born on Welsh soil, and whose first words would be spoken in Welsh." The ruse worked, and on that day was created the first prince of Wales of English lineage. In the Queen's Tower, a museum charts the history of the local regiment, the Royal Welsh Fusiliers. The castle is in the town of Caernarfon, 7 miles west of Llanberis.