SOLI INVICTO COMITI

Latin: to the unconquered Sun, minister [of the Emperor].

While previous emperors dedicated the coins to "Soli Invicto," Constantine coins are dedicated to "Soli Invicto Comiti." The word comiti, during imperial ages indicated a minister of the emperor (That's how the feudal title "count" originated).  Even the two consuls where called "comites" (check on Du Cange glossarium of mediae et infimae latinitatis).  The legend therefore reads: "to the unconquered Sun, minister (of the Emperor)." Basically it indicated that Sun was the maximum agency in the sky, as Constantine was on the earth; but both where subordinated to God.

DICTIONARY OF ROMAN COINS

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    SOLI INVICTO COMITI.----This legend, with the usual type of the Sun standing with right hand uplifted, and a globe in the left, occurs on brass coins of Constantine the Great----one of the relics of the old solar worship, which, like other symbols of paganism, appears on the mint of this professed convert to Christianity. The words SOLI INVICTO COMITI are found on two other medals of the same Emperor; one (third brass) with the radiate head of the Sun; and the other (gold and silver) wherein this god is represented standing with his crown of rays, a globe which he holds in his left hand; whilst with his right he places a crown on the head of Constantine, who holds the labarum, or Imperial standard. Both these coins have the name and portrait of Constantine on their obverse. In noticing them, in his remarks on the Caesars of Julian, Spanheim says they may be supposed to have been struck by the moneyers of some Roman cities still addicted to idolatry, or before they had solemnly renounced the worship of pagan gods. The fact is, however, that, with the exception of the In hoc sig. vic. legend of a doubtful medallion, all the epigraphs and types of the artful, cautious, and anything but pious or humane Constantine are drawn from heathen mythology, not from Christian theology. And, accordingly, we see on his medals the Sun represented as the Guide, Protector, and even Colleague of this emperor, with the inscription SOLI INVICTO and SOLI INVICTO COMITI.----See Comes.

    The same inscription of Soli invicto Comiti occurs on coins of Probus, Maximinus Daza, Crispus, and others.
  
    SOLI INVICTO COMITI.----The Sun placing a garland on the head of the Emperor, who

 stands, in military costume, holding a globe and spear; in the exergue SIRM. In gold and silver of Constantine. In the exergue of some, AQ. or other letters.

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