Tagma (military)
The tagma (Greek: τάγμα; pl.: tagmata, τάγματα) is a military unit of battalion or regiment size, especially the elite regiments formed by Byzantine emperor Constantine V and comprising the central army of the Byzantine Empire in the 8th–11th centuries. == History and role == In its original sense, the term "tagma" (from the Greek τάσσειν tássein, "to set in order") is attested from the 4th century and was used to refer to an infantry battalion of 200–400 men (also termed bandum or numerus in Latin, arithmos in Greek) in the contemporary Eastern Roman army.