Dom Duarte (1391–1438), as
Edward, King of Portugal, elaborated a Regimen (Ordenaçam) of the Chapel, which indicates that the standard practice was three-voice singing. His son,
Afonso V (1432–1481), sent the
mestre de capela Álvaro Afonso, to the court of
Henry VI of England (1421–1471) in order to get a copy of the statutes, regimen and liturgy practiced in the English
Chapel Royal. The detailed description written by
William Say is kept at
Évora. ==Mestres de capela==