In reference to the Old Roman Rite (before introduction of Gallican elements that helped form what is known as the Tridentine Liturgy):
In any case the old Roman Rite is not exactly that now used. Our Roman Missal has received considerable additions from Gallican sources. The original rite was simpler, more austere, had practically no ritual beyond the most necessary actions (see Bishop, “The Genius of the Roman Rite” in “Essays on Ceremonial”, edited by Vernon Staley, London, 1904, pp. 283-307). It may be said that our presentRoman Liturgy contains all the old nucleus, has lost nothing, but has additional Gallican elements.
The additions to the Roman rite, some of which originated in Jerusalem and the East as well as from Gallican rites, or via Gallican rites, form its more elaborate, decorative, and symbolic parts. The pure Roman rite was exceedingly simple, austere, and plain; nothing was done except for some reason of practical utility. Its prayers were short and dignified, but almost too austere when compared with the exuberant rhetoric of the East. In our Missal we have from non-Roman sources much of the Holy Week ritual, and such decorative and symbolic processions and blessings as those of Candlemas and Palm Sunday.