The Roman Army composition, equipment and tactics changed notably through the centuries and whilst some groups seek to demonstrate some of these changes in displays, most groups focus on a particular time period, often associated with the peak period of the legionary unit they represent.
The most popular period is probably the 1st-2nd century, with legionaries wearing the characteristic segmented armour illustrated on Trajan's Column.
Their group, claiming over 100 active members, includes participants from Poland, Germany, Luxembourg, the Netherlands & Czech Rep.[1] There are also other significant reenactment and living-history organizations that not only specialize in Roman military but include all other aspects of ancient Roman society with a holistic approach: the most notable example is Nova Roma, an umbrella organization with thousands of members[2] which is currently the largest network of Roman reenactment groups.
The Spartan Army is very popular as a theme, as can be evidenced by the group called The Hellenic Warriors,[4] who appear at museums, schools, and universities on the east coast of the United States.
Greek reenacting is popular in the United States, Europe and Australia and whose members from around the world will gather at the International Ancient Greek Hoplite Festival[5][6] Continental and insular Celts and Gauls are the subjects of some reenacting groups, with a focus on anything from tribal warfare to even domestic re-enactment of Pre-Roman Celtic societies.