Tre'r Ceiri is an iron age hillfort on the Llyn peninsula which was surveyed and excavated in the 1950s.
This collection is open for research. Access to some documents may be restricted due to Data Protection legislation, Gwynedd Archives will advise where this is the case. For details and opening hours see https://www.gwynedd.llyw.cymru/en/Residents/Libraries-and-archives/Archives-and-family-history/Archives-and-family-history.aspx.
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