The foundation stone of Christ Church, laid by Mary Cornelia, Marchioness of Londonderry, on 1 June 1881, has been preserved and is now displayed at the entrance of the library.
Mae carreg sylfaen Eglwys Crist, a osodwyd gan Mary Cornelia, Ardalyddes Londonderry, ar 1 Mehefin 1881, wedi'i chadw ac mae bellach yn cael ei harddangos wrth fynedfa'r llyfrgell.