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It's that pointed peak on the horizon.

According to Wikipedia, "Ysgyryd Fawr is the most easterly of the Black Mountains in Wales, part of the Brecon Beacons National Park. The name is often anglicised to The Skirrid or Skirrid Fawr, and the mountain is also known as Holy Mountain or Sacred Hill".

Near the base is reportedly the oldest pub in Wales "The Skirrid Mountain Inn in the small village of Llanfihangel Crucorney.. is listed in chronicles from 1100. Owain Glyndŵr is said to have rallied his forces in the cobbled courtyard in the early 1400s before raiding nearby settlements sympathetic to the English king, Henry IV."

You can't see it from the battlements of Raglan Castle, but I know it's there, just beyond the wheat fields.