> Many empires had diverse constituent troops types, the Achaemenids, the
Seleucids, the Macedonians, the Timurites, the Ottomans, even the
Reconquista
Spanish. This is nothing unusual for large Empires. Indeed, Rome was
rather
unusual for its homogeneity (although by the late Imperial period, this was
not the case either).
In the early Imperial period, Roman armies contained as many auxiliaries as
legionaries. These included a very wide range of troop types, from bands
of slingers to Sarmatian heavy cavalry.
Andrew