1. 
   Dupondius
   A Roman coin, usually made of brass or copper. Twice the value of an as. On dupondii, the head of the emperor was usually radiate. The plural is 'dupondii.'
   Found op http://www.forumancientcoins.com/
   
   
2. 
   Dupondius
   A 2 as Roman coin. (The as was the base unit of the Roman currency).
   Found op http://www.keystothepast.info/durhamcc/k2p.nsf/k2pGlossaryList?readform&let
   
   
3. 
   Dupondius
   The dupondius (Latin two-pounder) was a brass coin used during the Roman Empire and Roman Republic valued at 2 asses (1/2 of a sestertius or 1/8 of a denarius). The dupondius was introduced during the Roman Republic as a large cast coin, although even at introduction it weighed less than 2 pounds. ...
   Found op http://en.wikipedia.org/wiki/Dupondius
   
   

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