Noun
One of two Roman officers or magistrates united in the same public functions.
Source: Webster's dictionaryHis father was a provincial magistrate ( duumvir ) who bequeathed at his death the sum of nearly two million sesterces to his two sons. Source: Internet
Livy records that in 192 BC, duumvir Q. Marcus Ralla dedicated to Jupiter on the Capitol the two temples promised by L. Furius Purpureo, one of which was that promised during the war against the Gauls. Source: Internet