Arch of Septimius Severus, dedicatory inscription on the western side, Forum Romanum, Rome.

The white marble Arch of Septimius Severus (Italian: Arco di Settimio Severo) at the northwest end of the Roman Forum is a triumphal arch dedicated in AD 203 to commemorate the Parthian victories of Emperor Septimius Severus and his two sons, Caracalla and Geta, in the two campaigns against the Parthians of 194/195 and 197-199.
After the death of Septimius Severus, his sons Caracalla and Geta were initially joint emperors. Caracalla had Geta assassinated in 212; Geta's memorials were destroyed and all images or mentions of him were removed from public buildings and monuments. Accordingly, Geta's image and inscriptions referring to him were removed from the arch.
The Arch stands close to the foot of the Capitoline Hill. A flight of steps originally led to the central opening. By the 4th century erosion had raised the level of the Forum so much that a roadway was put through the Arch for the first time. So much debris and silt eroded from the surrounding hills that the arch was embedded to the base of the columns. The damage wrought by wheeled medieval and early modern traffic can still be seen on the column bases, above the bas-reliefs of the socles.
During the Middle Ages repeated flooding of the low-lying Forum washed in so much additional sediment and debris that when Canaletto painted it in 1742, only the upper half of the Arch showed above ground. The well-preserved condition of the Arch owes a good deal to its having been incorporated into the structure of a Christian church, given 1199 by Pope Innocent III to the church of S Sergio and Bacco. Half the Arch belonged to the Cimini family, who are also attributed for the preservation of the structure (Claustrum Cimini). The stronghold included a tower placed on top of the Arch itself. When the church was refounded elsewhere, the arch remained ecclesiastical property and was not demolished for other construction.

The dedicatory inscription on the arch reads:

IMP · CAES · LVCIO · SEPTIMIO · M · FIL · SEVERO · PIO · PERTINACI · AVG · PATRI PATRIAE PARTHICO · ARABICO · ET PARTHICO · ADIABENICO · PONTIFIC · MAXIMO · TRIBUNIC · POTEST · XI · IMP · XI · COS · III · PROCOS · ET IMP · CAES · M · AVRELIO · L · FIL · ANTONINO · AVG · PIO · FELICI · TRIBUNIC · POTEST · VI · COS · PROCOS · (P · P · OPTIMIS · FORTISSIMISQVE · PRINCIPIBUS) OB · REM · PVBLICAM · RESTITVTAM · IMPERIVMQVE · POPVLI · ROMANI · PROPAGATVM · INSIGNIBVS · VIRTVTIBVS · EORVM · DOMI · FORISQVE · S · P · Q · R

Imp(eratori) Caes(ari) Lucio Septimio M(arci) fil(io) Severo Pio Pertinaci Aug(usto) patri patriae Parthico Arabico et Parthico Adiabenico pontific(i) maximo tribunic(ia) potest(ate) XI imp(eratori) XI, co(n)s(uli) III proco(n)s(uli) et imp(eratori) Caes(ari) M(arco) Aurelio L(ucii) fil(io) Antonino Aug(usto) Pio Felici tribunic(ia) potest(ate) VI co(n)s(uli) proco(n)s(uli) (p(atri) p(atriae) optimis fortissimisque principibus) ob rem publicam restitutam imperiumque populi Romani propagatum insignibus virtutibus eorum domi forisque S(enatus) P(opulus) Q(ue) R(omanus).

Translation: "Septimius Severus, Lucius Caesar the son of Pertinax the Emperor Marcus, the emperor Augustus Pius, Father of his Country 11 power of the tribunes of the Parthians, Parthian Adiabenico Arabic, and 3 and an imperial proconsul Marcus Licinius the Pontifex Maximus , the consul Aurelius Antoninus Augustus Pius Felix , the son of the consul of the proconsul to control and power of the tribunes of the people of the state to establish the vI the insignia of the Roman senate and people of the increase of the powers of the Romans, at home and abroad."

more on https://en.wikipedia.org/wiki/Arch_of_Septimius_Severus , http://sights.seindal.dk/sight/161_Arch_of_Septimius_Severus.html , https://en.wikipedia.org/wiki/Roman_Forum , https://de.wikipedia.org/wiki/Datei:Map_of_downtown_Rome_during_the_Roman_Empire_large.png http://dlib.etc.ucla.edu/projects/Forum/reconstructions/ForumRomanum_1