Roman mosaics and sarcophagi attest to various representations of this exotic triumphal procession. Caesar's march on Rome was a triumphal procession. The main entrance emphasized the portico, which resembled a triumphal arch. It had a portico with classical columns resembling a triumphal arch. Roman mosaics and sarcophagi attest to various representations of a Dionysus-like exotic triumphal procession. Most Roman triumphal arches were built during the imperial period. Most Roman triumphal arches were built during the Imperial period. Gothic Revival architecture began its triumphal march. Along the way they come across five triumphal processions celebrating their union. The Arch of Janus is the only quadrifrons triumphal arch preserved in Rome. The central window resembles a triumphal arch. The origins of the Roman triumphal arch are unclear. The fountain is placed in a triumphal arch between the stairways. Other examples include imperial triumphal arches (see List of Roman triumphal arches). Some scholars have viewed the "triumphator" as embodying (or impersonating) Jupiter in the triumphal procession.