Gloucester the remains (a gateway and some walls) of Llanthony Secunda Priory, a cell of the mother abbey in the Vale of Ewyas, Monmouthshire, which in the reign of King Edward IV became the secondary establishment. The Three Choirs Festival, originating in the 18th century and one of the oldest music festivals in the British Isles, is held in Gloucester every third year, the other venues being Hereford and Worcester. Gloucester hosted the festival in 2016, and it is next due in the city in 2019. The city's main theatre and cultural venue is the Guildhall. The Guildhall hosts a huge
Hereford Cathedral altar-piece and an oak screen, and instead of restoring the Chapter House he allowed its stones to be utilised for alterations to the Bishop's Palace. It was during this period that his brother, Thomas Bisse, was the Chancellor of the Cathedral. In 1724 Thomas Bisse organised a "Music Meeting" which subsequently became, with the Cathedrals at Worcester and Gloucester, the Three Choirs Festival. On Easter Monday, 1786, the greatest disaster in the history of the cathedral took place. The west tower fell, creating a ruin of the whole of the west front and at least one part of the nave.