Lanciarii are attested as names of late Roman units, including prestigious field formations. The connection of the name with a throwing spear does not make every lanciarius an exclusively light, unarmoured skirmisher. A unit’s name, individual weapons and tactical role are distinct questions.
For a mobile javelin-thrower impression, a shield and javelins are appropriate; sword, helmet and armour should follow specific evidence. Light troops could operate before the line, retire under heavy infantry protection and join pursuit. Vegetius offers recommendations for cooperation between troops, not proof of an identical fourth rank in every legion. Republican antesignani cannot simply be equated with later lanciarii units.
The equipment of the lanciarii of the Dominate era may include the following elements:
Fabric and leather products:
Elements of protective equipment made of metal and wood:
Weapons:
Other elements:
The lanciarius set may not contain all of the aforementioned items. The javelins might be of just one type, light or heavy, and the sword might not be present at all.
A starting javelin-thrower reenactment kit can be relatively simple: clothing, footwear, belt, shield and javelins. This is a practical choice for an impression, not evidence that every lanciarius lacked armour. Tunic colour and the choice of sagum or chlamys should be considered against date, region and reenactment-group requirements.
1) The Roman Army in the IV century. From Constantine to Theodosius. A.V. Bannikov
2) Armies of the Late Roman Empire. AD 284 to 476. History, Organization and Equipment. G. Esposito
3) De Re Militari. Publius Flavius Vegetius Renatus
4) Rerum Gestarum. Ammianus Marcellinus
5) Parallel lives. Plutarch




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