Constantine the Great AE3. 321 AD. 

Obv: CONSTANTINVS AVG, laureate, mantled bust left holding eagle tipped scepter
Rev: BEATA TRANQVILLITAS, altar inscribed VOT/IS/XX, surmounted by globe, 
 three stars above, PTR in ex. 

RIC Rarity R4.

Contributed by Bob Effler, March, 2005.