{{Use dmy dates|date=November 2025}} [[File:Sant Rhystud, St Rhystud's Church, Ceredigion, Cymru, Wales 18.jpg|thumb|Saint Rhystyd depicted in a stained glass window at St Rhystud's Church, Ceredigion.]] thumb|St Rhystyd's church, Llanrhystud '''Rhystyd''' was a late 6th-century British saint reputed to be a grandson of Hywel the Great (Hywel fab Emyr Llydaw) and brother to Saint Cristiolus and Saint Silin.<ref name=":0">{{Cite book |last1=Baring-Gould|first1= Sabine |title=The Lives of the British Saints Vol. IV |publisher=The Honourable Society of Cymmrodorion, London |year=1913 |pages=117}}</ref><ref>{{Cite web |title=Genealogies of the Saints – Seintiau |url=https://saints.wales/genealogies-of-the-saints/ |access-date=3 June 2025 |language=en-US}}</ref><ref>{{Cite book |last=Baring-Gould |first=Sabine |title=The Lives of the Saints Vol. XIII |year=1898 |pages=195}}</ref> The village of Llanrhystud is named for the parish church which is dedicated to him.
== Name == Rhystyd is thought to represent the Latin Restitutus, a common ecclesicatical name borne by the earliest known Bishop of London who attended the Council of Arles in 314.<ref name=":0" /> The name also appears as Rhystud. He is sometimes confused with a Saint Rhystyd Hên who was Bishop of Caerleon-on-Usk.
== Veneration == His feast is said to have been celebrated on the "Thursday in the Ember Week before Christmas" in the form of a fair.<ref name=":0" /> The Ember Week before Christmas traditionally takes place in the 51st week of the year (the penultimate week in non-leap years).
An apocryphal poem by the celebrated 14th century Welsh bard Dafydd ap Gwilym associates Rhystyd with Saint Dwynwen, the Welsh patron saint of lovers: <ref name=":0" /><ref>{{Cite book |last=Morgan |first=Thomas |title=Handbook of the Origin of Place-names in Wales and Monmouthshire |publisher=H.W. Southey |year=1887 |location=Merthyr Tydful |pages=65}}</ref><ref>{{Cite journal |last=Zhao |first=Xiezhen |date=2021 |title=Dreams in Medieval Welsh Literature |journal=Cardiff University |pages=251}}</ref>
{{Translated blockquote | quote = Rhystud Sant, rhyw ystod serch,
A'i elinedd ar lanerch,
A'i ben ar Ddwynwen enyd,
Huno bu'n hwya'n y byd | translation = Saint Rhystyd, during some period of love
And his elbows on the glade
And his head on Dwynwen for a while
Slept the longest in the world | language = Cy | author = Dafydd ap Gwilym | title = "Yr Hun Felys" | source = lines 51–54 }}
A stained-glass window depicting Rhystyd dating to 1965 is located on the eastern wall of the south aisle of St Rhystyd's Church, in Llanrhystud.<ref>{{Cite web |title=St Rhystud detail from Virgin Mary and St Rhystud – image from Stained Glass in Wales |url=https://stainedglass.llgc.org.uk/image/5893 |access-date=3 June 2025 |website=stainedglass.llgc.org.uk}}</ref>
== References == <references /> {{DEFAULTSORT:Rhystyd}} Category:Medieval Welsh saints