The father of Vespasian, the Roman Emperor who freed Joseph of Arimathea from prison in the Vulgate Estoire del Saint Graal. Maerlant calls him Tiberius.
In the Third Continuation of Chrétien’s Perceval, Titus brings Joseph of Arimathea to Rome.
An actual Emperor Titus ruled Rome from AD 79-81, but his reign came after Vespasian’s.
Source
Vulgate Estoire del Saint Graal | 1220-1235