 Ambrose and Gregory the Great, who are known for their contributions to the formulation of Gregorian chant, are credited with 'antiphonaries', collections of works suitable for antiphon, which are still used in the Roman Catholic Church today.Polyphonic Marian antiphons emerged in England in the 14th century as settings of texts honouring the Virgin Mary, which were sung separately from the mass and office, often after Compline.Towards the end of the 15th century, English composers produced expanded settings up to nine parts, with increasing complexity and vocal range.