According to Livy and Dionysios of Halicarnassos the Roman king Servius Tullius introduced tributum, the war tax, as this institution allegedly formed part of the socalled
Servian Constitution. However, it is unlikely that the two historians' accounts are accurate. Rather, tributum should be seen in close conjunction with stipendium, i.e. pay to the Roman soldiers, which was probably introduced around 400 BC in connecrion with the war against Veii.