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*Eglwys y Bedd ("Church of the grave") (sometimes referred to as Llan y Gwyddel, or "Church of the Irishman") is all that remains of a 14th-century church in Anglesey, north Wales. It is set within the churchyard of St Cybi's, Holyhead, and may have been built on the site where Cybi (a 6th-century Celtic saint who settled in Holyhead) lived and ministered. It is reputed to house the grave of Seregri, an Irish warrior who lived in the area in the 5th century.

It is a Grade II listed building, a national designation given to "buildings of special interest, which warrant every effort being made to preserve them".[1] It housed the first school in Holyhead in the 18th century and is now used by St Cybi's church.
* Courtesy of Wikipedia