Yn ystod eu hymweliad â'r Llyfrgell cafodd y disgyblion gyfle i archwilio ffacsimili o lawysgrif Llyfr Gwyn Rhydderch, sy’n cynnwys y casgliad cynharaf y gwyddys amdanynt o’r chwedlau y cyfeirir atynt heddiw fel y Mabinogion. Mae’r straeon yn parhau i ysbrydoli ffilmiau a llyfrau ledled y byd.
During their visit to the Library, the pupils got to examine a facsimile of the White Book of Rhydderch which contains the earliest known copy of the collection of legends referred to today as the Mabinogion. These tales continue to inspire films, television series and books around the world.