For the logic design software, see Altera Quartus.
Quartus (Greek: Κούαρτος, Kouartos) was a Christian who sent greetings to friends in Rome through Paul of Tarsus (Romans 16:23).
According to church tradition, he is known as Quartus of Berytus and is numbered among the Seventy Disciples. He was Bishop of Beirut and suffered for the faith. He converted many to the Christian faith. His feast day is November 10.
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The New American Standard Bible translates Romans 16:23 as follows:
Gaius, host to me and to the whole church, greets you. Erastus, the city treasurer greets you, and Quartus, the brother.
-- Romans 16:23
Although the literal translation of the Greek is that Quartus is "the" brother, most scholars interpret this as meaning that Quartus is a fellow believer, rather than a brother of Erastus. Thus, some translations such as the NIV translate the phrase as "our brother Quartus".
If Paul wrote the Epistle to the Romans from Corinth, it would suggest that Quartus was a Corinthian.
Troparion (Tone 3)
Holy Apostles, Erastus, Olympas, Herodian, Sosipater, Quartus and Tertius,
entreat the merciful God,
to grant our souls forgiveness of transgressions.
Kontakion (Tone 2)
Illumined by divine light, O holy apostles,
you wisely destroyed the works of idolatry.
When you caught all the pagans you brought them to the Master
and taught them to glorify the Trinity.
Source: St. Nikolai Velimirovic, The Prologue from Ohrid