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
A scaffolding of boards was erected at
the expense of the state in the Circus for the first three days, and
suitable representations were provided on it for the entertainment of
the multitude. That matters might not be carried too far however in
this way, a fixed sum of 200,000 -asses- (2055 pounds) once for all
appropriated from the exchequer for the expenses of the festival; and
the sum was not increased up to the period of the Punic wars. The
aediles, who had to expend this sum, were obliged to defray any
additional amount out of their own pockets; and it is not probable
that they at this time contributed often or considerably from their
own resources.
That the new stage was generally under Greek influence,
is proved by its very name (-scaena-, --skene--). It was no doubt at
first designed merely for musicians and buffoons of all sorts, amongst
whom the dancers to the flute, particularly those then so celebrated
from Etruria, were probably the most distinguished; but a public stage
had at any rate now arisen in Rome and it soon became open also to
the Roman poets.