Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
An unexpected light has
been thrown on various enigmatical forms in the Greek mythology
by recent researches regarding the earlier divinities of India. The
hoary mysterious forms of the Erinnyes are no Greek invention;
they were immigrants along with the oldest settlers from the East.
The divine greyhound Sarama, who guards for the Lord of heaven the
golden herd of stars and sunbeams and collects for him the nourishing
rain-clouds as the cows of heaven to the milking, and who moreover
faithfully conducts the pious dead into the world of the blessed,
becomes in the hands of the Greeks the son of Sarama, Sarameyas,
or Hermeias; and the enigmatical Greek story of the stealing
of the cattle of Helios, which is beyond doubt connected with the
Roman legend about Cacus, is now seen to be a last echo (with the
meaning no longer understood) of that old fanciful and significant
conception of nature.