Penda is said Communication to have laid Placing siege to the town until the exiled British High King Cadwallon of Gwynedd , arrived Arriving to confront him .

An alliance between British and Mercian forces followed Motion , secured Assistance by Cadwallon 's marriage Forming_relationships to Alcfrith , Penda 's sister , and they marched Motion_directional north to face the armies of Northumbria ( who were occupying Gwynedd ) at the Battle of Cefn Digoll .

Hard Rock Hell is a three day music festival Social_event currently held Hold at Hafan y Môr Holiday Park , Pwllheli , Gwynedd , North Wales , and up until 2011 at Pontin 's Holiday Village , Prestatyn , Wales .