'Pabo' originates from the tale of St Pabo, a 5th century king exiled to Anglesey and later aquiried sainthood. It's said he founded Llanbabo church, where he's thought to be buried there with his daughters.

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The illustration is based on the shape of a crown carving on a 14th century grave slab inside the church. It shows a man wearing a crown and holding a sceptre, with the carved words 'Here lies Pabo Post Prydein' in Latin beside him.