It is mentioned from The Catholic Encyclopedia website: In
reference to there being three kings: No Father of the Church
holds the Magi to have been kings. Tertullian ("Adv. Marcion.",
III, xiii) says that they were wellnigh kings (fere reges), and
so agrees with what we have concluded from non-Biblical
evidence. The [Catholic] Church, indeed, in her liturgy, applies
to the Magi the words: "The kings of Tharsis and the islands
shall offer presents; the kings of the Arabians and of Saba
shall bring him gifts: and all the kings of the earth shall
adore him" (Psalm 71:10). But this use of the text in reference
to them no more proves that they were kings than it traces their
journey from Tharsis, Arabia, and Saba. [About there being
three] Among the Latins, from the seventh century, we find
slight variants of the names, Gaspar, Melchior, and Balthasar;
the Martyrology mentions St. Gaspar, on the first, St. Melchior,
on the sixth, and St. Balthasar, on the eleventh of January.
Another reason that there are traditi