The design is a tribute to Kidwelly Castle. Ysgol Gymraeg Gwenllian is a designated Welsh-medium school situated in the centre of Kidwelly, Carmarthenshire. The school is located near the wonderful castle of Kidwelly.

Mae Ysgol Gymraeg Gwenllian yn ysgol benodedig Gymraeg yng nghanol Cydweli, Sir Gaerfyrddin. Mae’r castell hwn yn talu teyrnged i gastell arbennig, sef Castell Cydweli, sydd wedi’i leoli ger yr ysgol.