Apostolic Tradition in the context of "Irenaeus of Lyon"

Irenaeus (/ɪrɪˈneɪəs/ or /ˌaɪrɪˈniːəs/; Ancient Greek: Εἰρηναῖος, romanized: Eirēnaîos; c. 125 – c. 202 AD) was a Greek bishop noted for his role in guiding and expanding Christian communities in the southern regions of present-day France and, more widely, for the development of Christian theology by opposing Gnostic interpretations of Christian Scripture and defending orthodoxy. Originating from Smyrna, he had seen and heard the preaching of Polycarp, who in turn was said to have heard John the Evangelist.

Chosen as Bishop of Lugdunum, now Lyon, Irenaeus wrote his best-known work Against Heresies around 180 as a refutation of gnosticism, in particular that of Valentinus. To counter the doctrines of the gnostic sects claiming secret wisdom, he offered three pillars of orthodoxy: the scriptures, the tradition said to be handed down from the apostles, and the teaching of the apostles' successors. He is the earliest surviving witness to regard all four of the now-canonical gospels as essential.

Making the sign of the cross (Latin: signum crucis), also known as blessing oneself or crossing oneself, is both a prayer and a ritual blessing made by members of some branches of Christianity. It is a very significant prayer because Christians are acknowledging their belief in the triune God, or the Holy Trinity: God the Father, God the Son and God the Holy Spirit. There are three variants of the sign of the cross, including a large sign of the cross made across the body, a small sign of the cross traced on the forehead or objects, as well as a lesser sign of the cross made over the forehead, lips and heart.

The use of the sign of the cross traces back to early Christianity, with the third-century treatise Apostolic Tradition directing that it be used during the minor exorcism of baptism, during ablutions before praying at fixed prayer times, and in times of temptation.

Christian head covering, also known as Christian veiling, is the traditional practice of women covering their head in a variety of Christian denominations. Some Christian women wear the head covering in public worship and during private prayer at home, while others (particularly Conservative Anabaptists) believe women should wear head coverings at all times. Many theologians of the Oriental and Eastern Orthodox Churches likewise teach that it is "expected of all women to be covered not only during liturgical periods of prayer, but at all times, for this was their honor and sign of authority given by our Lord", while others have held that headcovering should at least be done during prayer and worship. Genesis 24:65 records the veil as a feminine emblem of modesty.

Manuals of early Christianity, including the Didascalia Apostolorum and Pædagogus, instructed that a headcovering must be worn by women during prayer and worship as well as when outside the home. When Paul the Apostle commanded women to be veiled in 1 Corinthians, the surrounding pagan Greek women did not wear head coverings; as such, the practice of Christian headcovering was countercultural in the Apostolic Era, being a biblical ordinance rather than a cultural tradition. The style of headcovering varies by region, though Apostolic Tradition specifies an "opaque cloth, not with a veil of thin linen".