Matheus de Sancto Johanne (died after 10 June 1391), also known as Mayshuet,[1] was a French composer of the late Medieval era.
Active both in France and England, he was one of the representatives of the complex, manneristic musical style known as the ars subtilior which flourished around the court of the Avignon Papacy during the Great Schism.
The next ten years are a blank, but at some time during this period he had begun working for Robert of Geneva, who later became Antipope Clement VII.
In November 1378 – the same year Clement became pope – he is recorded as being a clerk for the Louis I, Duke of Anjou, and between 1382 and 1387 he was at the papal court in Avignon as a chaplain.
[4] The motet Ave post libamina is included in Corpus mensurabilis musicae, vol.