Roman
Originally there were no special native characteristics by which Roman work could be distinguished, as the Romans absorbed various influences from the races that they conquered. Their conquests extended East and West, and from these widely differing outside influences the Roman style developed.
The Romans, who by temperament, were great soldiers, organisers and engineers, rather than artistic, in their early essays in architecture were influenced by Etruscan work.
Etruria (now Tuscany) is presumed to have been a Greek colony, and the local style, a form of debased Doric, was adopted by the first Tarquin (who was of Etruscan origin) and introduced to Rome about 610 B.C.
With the growth of the Roman Empire, and its consequent wealth and development of luxury, great impetus was given to building and the arts generally.
The orders based on the Greek originals were developed in detail and proportion, particularly in the latter respect. Whereas in the Greek Doric the height of the column varied from about four, to six and a half diameters, the Roman version became more slender, being about eight diameters in height.
The Corinthian order, perhaps, underwent the greatest change, a change that has practically remained unaltered to the present day.