Treboeth is a suburb and historical village in the Mynydd-Bach ward of Swansea, Wales. Gwyrosydd Primary School and Welsh language primary school Ysgol Gynradd Gymraeg Tirdeunaw are located in Treboeth. Gwyrosydd was the Bardic name of Treboeth-born Daniel James, author of the popular Welsh language hymn Calon Lân, which is often sung in rugby matches, Welsh religious ceremonies and other events.