The High School of Glasgow is an independent, co-educational day school in Glasgow, Scotland. The original High School of Glasgow was founded as the Choir School of Glasgow Cathedral in around 1124, and was the oldest school in Scotland, and the twelfth oldest in the United Kingdom. It remained part of the Church as the city's grammar school until coming under local authority control in 1872, and closed in 1976, when the private Drewsteighnton School adopted the name. The School maintains a relationship with the Cathedral, where it holds an annual Service of Commemoration and Thanksgiving in September.