What remains of the Temple of Vespasian and Titus is located at the western end of the Forum between the Temple of Concord and the Temple of Saturn.
The temple is dedicated to the emperor Vespasian (r. 69-79) and his son Titus (r. 79-81), who were both deified after their deaths. It was begun by Titus and completed by Domitian (r. 81-96), his younger brother and successor as emperor.
The Temple of Vespasian and Titus by Piranesi
The three columns of the Temple of Vespasian appear (albeit largely buried) in an etching by Piranesi (1720-78), when it was thought to be the remains of the Temple of Jupiter.