The Apostolic Constitutions or Constitutions of the Holy Apostles (Latin: Constitutiones Apostolorum) is a Christian collection of eight treatises which belongs the Church Orders, a genre of early Christian literature, that offered authoritative "apostolic" prescriptions on moral conduct, liturgy and Church organization. The work can be dated from 375 to 380 AD. The provenance is usually regarded as Syria, probably Antioch. The author is unknown, even if since James Ussher it was considered to be the same author of the letters of Pseudo-Ignatius, perhaps the 4th-century Eunomian bishop Julian of Cilicia.