The inscription in Roman square capitals reads:
SENATVS
POPVLVSQVE·ROMANVS
DIVO·TITO·DIVI·VESPASIANI·F(ILIO)
VESPASIANO·AVGVSTO
(Senatus Populusque Romanus divo Tito divi Vespasiani filio Vespasiano Augusto) which means "The Roman Senate and People (dedicate this) to the divine Titus Vespasianus Augustus, son of the divine Vespasian."
The opposite side of the Arch of Titus received new inscriptions after it was restored during the pontificate of Pope Pius VII by Giuseppe Valadier in 1821. The restoration was intentionally made in travertine to differentiate between the original and the restored portions.
The inscription reads:
INSIGNE · RELIGIONIS · ATQVE · ARTIS · MONVMENTVM
VETVSTATE · FATISCENS
PIVS · SEPTIMVS · PONTIFEX · MAX(IMVS)
NOVIS · OPERIBVS · PRISCVM · EXEMPLAR · IMITANTIBVS
FVLCIRI · SERVARIQVE · IVSSIT
ANNO · SACRI · PRINCIPATVS · EIVS · XXIIII
(Insigne religionis atque artis, monumentum, vetustate fatiscens: Pius Septimus, Pontifex Maximus, novis operibus priscum exemplar imitantibus fulciri servarique iussit. Anno sacri principatus eius XXIV)
(This) monument, remarkable in terms of both religion and art, had weakened from age:
Pius the Seventh, Supreme Pontiff, by new works on the model of the ancient