Question

Of the Romans "group of three" gods in the Archaic Triad, which one did not have a Greek counterpart?

Answer 1

The Archaic Triad consisted of Jupiter, Mars, and Quirinus. The Greek counterpart of Jupiter was Zeus, and the Greek counterpart of Mars was Ares. The Roman gods "group of three" in the Archaic Triad which does not have a Greek counterpart is none.