Oswald of Northumbria
Welsh: 'Ardent lord', from (lord, prince) + (ardent, enthusiastic, impulsive). It lends its name to the mountain ('Idris's Chair') by way of ('Idris the Giant'). The story of is believed to have come from the monkish king Idris of , who was slain in a battle with Oswald of Northumbria on the River Severn. This indicates that the name may very well have been used in Wales well before his final stand in 632.