In ancient Rome, adsidui (also assidui; sg. adsiduus or assiduus, Latin for "diligent, loyal", and collectively, "tax-payers") were the citizens who were liable to military service in the main line of battle, that is, for much of the history of the Roman republic, as legionaries. The adsidui were the members of the first five census classes, which were, according to the Roman historian Livy, created under the reign of Servius Tullius, the sixth legendary king of ancient Rome. Under Tullius' original organisation, the first class was made of the richest, and thus best-equipped citizens, with helmet, shield, greaves, cuirass, spear and sword. As one went down through the classes and the corresponding levels of wealth, equipment went lighter and lighter. According to Peter Connolly, the goal