Historically, where and when does the idea that there are seven sacraments originate?

Sacramental theology is one of the key differences between different branches of Christianity. Different groups disagree even on what is meant by a "sacrament", and by how many they are or what should be considered a sacrament. There is pretty wide agreement that Baptism and Holy Communion are sacraments, though some of the more radical Protestants such as Anabaptists would consider these *ordinances* not *sacraments*. Among Protestants, Reformed Churches generally recognize these as the only sacraments, while Lutherans sometimes also include Confession & Absolution as a third. Others, such as Moravians or Anglicans, may have more. However, my question was stirred up by the non-Protestant Nicene Churches: The Catholic Church, Eastern Orthodox, Oriental Orthodox, and Assyrian Church of the East. These churches all agree that there are seven sacraments (or *mysteries* in the Eastern Orthodox Church, "mystery" being the Greek equivalent to the Latin "sacrament"). The Catholic, EO, and OO agree on the list of the seven sacraments/mysteries: Baptism, Confirmation, Communion, Penance, Marriage, Ordination, and Extreme Unction (this last one seems to differ considerably between the different traditions). However, the Assyrian Church of the East has a slightly different list of seven sacraments : They include the Holy Leaven (*Malka*) and the Sign of the Cross in place of Marriage and Confirmation. **This made me curious how the traditions of the East and the broad West came to different lists.** It's interesting that the Churches of the East were also the first of these traditions to branch off from the West, with their split happening regarding the Council of Ephesus in 431. **Could it be that the idea that their should be seven sacraments arose prior to the Council of Ephesus, but the actual list of them had not been settled yet at that time?** I'm curious about the ancient history of the idea of an enumeration of the sacraments. I have observed that St. Augustine, at the very least, is much more generous in applying the word "sacrament" to things than later traditions are. This suggests that, during his time, the word had not yet obtained its technical meaning. In conclusion, my main question is, **when and where do we find the origin of the idea that there are seven sacraments? And, when do we first find people attempting to catalogue the full list of sacraments?**