From 1941 Dumézil expanded his project by adding the three legendary tribes of Roman synoikismos: the Ramnes (companions of Romulus), the Luceres (companions of the Etruscan warrior Lucumon and allies of Romulus against the wealthy subjects of Titius Tatius), and the Tities or Titienses. He had refrained from mentioning these tribes in his 1938 article “La préhistoire des flamines majeurs”, in which he had established for the first time the correspondence, by virtue of their common prehistoric ideology, between the Vedic social classes and the major flamens of Rome (Jupiter, Mars, and Quirinus). In the three Roman tribes he now recognized mythic equivalents of real functional classes, for this reason alone seeing them as comparable to their Indo-Iranian or Celtic homologues:

In the face of the difficulties raised by this thesis, which was unconfirmed by any historical or archaeological document, Dumézil tried to make do with an artificial solution too ingenious to be convincing: he conceded that only the aristocracy had needed to be divided into “three functional groups,” whereas the rest, the undifferentiated mass of Roman people, had not required any exclusive, lasting specialization (JMQ4, 160, 165; Héritage, 189, 221).