ScarySerpent

21) This scary monstrous serpent is sometimes shown on the reverse of Roman Imperial coins of the earlier Emperors.. Nero, Trajan, Hadrian, Antoninus Pius, etc..... surprisingly it is a protector of grain and vineyards, and supposed to bring good luck a) what is its name....... b) though of ancient Greek origin,to what province/country does it relate particularly in these Roman coins......?