[1] Elystan Glodrydd, who died in 1010AD, was possibly buried at Trelystan, as the Welsh placename could derive from Cappell Tref Elistan.

This is first mentioned in the Harleian Manuscript 1973, written by Jacob Chaloner: Elistan Glodrith, or Edelstan the renowned, borne in the Castell of Hereford, anno 933, and in the 9 yeare of Edlistan, K of Saxons, who was his godfather, was Earle of Hereford, and Lord of the countrey above Offa dich, betwene Wy and Severne, in tyme of Edelred, K of Saxons.

[2]In 1485, Long Mountain by Trelystan was the muster point of the Welsh army of Henry Tudor, led by military commander Sir Rhys ap Thomas.

[4] St Mary's Church, Trelystan is sited 900 feet up at the S end of the Long Mountain to the east of Welshpool.

Possibly at a later date lathes had been nailed to the framing, and this had then been torched, such that the outside of the church, before the 1856 restoration, would have presented a smooth rendered surface.

The truss at the west end defines the position of the former gallery, which was originally reached by a ladder stair set in the north-west corner.

The front of the bell turret, formerly the gallery, has close-set studs, plastered between, with a large thick beam for the top rail.

Reached by a track across fields, six yews of considerable age encircle the west side of the church; the largest being by the south porch.