Anonymous, struck struck 330-333 under Constantine.

VRBS ROMA, Helmeted bust of Roma, left
  The wolf and twins (Romulus and Remus) of the foundation legend of Rome.
  Two stars above.
  ΓSIS for the Siscia mint, third officina.
  19 mm. 2.87 grams.
  RIC VII Siscia 222, struck 330-333.
  Failmezger 364 (this type, earlier and larger) and 370 and 378 (later and a bit smaller).

The type commemorates the foundation of Constantinople. For more about it, see my page on the coins that commemorate the founding of Constantinople:

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