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    NPRN11
    Map ReferenceSH66NW
    Grid ReferenceSH6261066010
    Unitary (Local) AuthorityGwynedd
    Old CountyCaernarfonshire
    CommunityBethesda
    Type Of SiteTOWER
    PeriodPost Medieval, Medieval
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    Description
    Ty'n-Twy Tower was a small medieval tower, possibly the Twr Abercaseg mentioned in 1254 that guarded the Ogwen crossing and approach to Nant Frangcon. The tower is mentioned as being transferred to the ownership of the Griffiths of Penrhyn in 1458.

    Reference: Cadw listed buildings database.

    RCAHMW, November 2009