The family of Plautius Quintillus was of consular rank and was politically active during the Nerva–Antonine dynasty in the 2nd century. Quintillus’ birth name could have been Lucius Titius Plautius Quintillus. His father was probably Lucius Titius Epidius Aquilinus, who served as consul in 125 under the EmperorHadrian. According to a preserved incomplete inscription found in Rome, Aquilinus may have been the head of a priestly college and could have hosted a public entertainment event held in Rome. His brother may have been Lucius Titius Plautius Aquilinus, who served as consul in 162 under the co-Emperors Marcus Aurelius and Lucius Verus.
Throughout the former Roman Empire, various honorific inscriptions dedicated to Quintillus and his family have been found, mentioning him, his wife, his son and his relation to Lucius Verus.
^The epitomator of Cassius Dio (72.22) gives the story that Faustina the Elder promised to marry Avidius Cassius. This is also echoed in HA"Marcus Aurelius" 24.