Tomen yr Allt

Tomen yr Allt (or Domen yr Allt) was a Medieval motte and bailey defensive castle near Llanfyllin in Powys, Wales. "Tomen ar hallt" is modern Welsh for "mound on the wooded hillside."

Tomen yr Allt
Tomen yr Allt within Wales
LocationNear Llanfyllin
RegionPowys, Wales
Coordinates52°46′49.33″N 3°17′45.71″W
TypeMotte and Bailey Castle
Part ofKingdom of Powys until 1160, then Principality of Powys Wenwynwyn.
Length40 m
Width40 m
History
MaterialEarthwork and timber
FoundedPossibly 10th century
Abandoned1257 (keep destroyed)
PeriodsMedieval
Satellite ofCantref of Mechain
Associated withLords of commote of Mechain Uwch Coed
EventsPut under siege by Llywelyn ap Gruffudd in 1257
Site notes
Excavation dates1978
ArchaeologistsClwyd-Powys Archaeological Trust
ConditionRuin - only earthworks remaining and very overgrown
DesignationCadw scheduled monument
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