Tir Iarll

{{Short description|Traditional name for part of Glamorgan, Wales}}

{{Use dmy dates|date=April 2022}}

{{langnf|cy|Tir Iarll|Earl's Land|italic=no|paren=left}}; {{IPA|cy|ˌtiːr ˈjarɬ}}), is the traditional name of an area of Glamorgan, Wales, which has long had a particular resonance in Welsh culture.{{cite book |editor1-first=John |editor1-last=Davies|editor1-link=John Davies (historian)|editor2-first=Nigel |editor2-last=Jenkins | editor2-link=Nigel Jenkins| editor3-first=Baines |editor3-last=Menna|editor4-first=Peredur I. |editor4-last=Lynch|title=The Welsh Academy Encyclopaedia of Wales |year=2008 |publisher=University of Wales Press |location=Cardiff|page=872 |isbn=978-0-7083-1953-6}}

In medieval times Tir Iarll was a cwmwd covering the present-day parishes of Llangynwyd, Betws, Cynffig and Margam. It long preserved traditional customs, notably the Mari Lwyd or Grey Mare.

The late medieval Welsh poets Rhys Brydydd, his son Rhisiart ap Rhys and brother (or son) Gwilym Tew all came from Tir Iarll.