Salonia Matidia, Roman daughter of Ulpia Marciana (died 119)

AD 68 (LXVIII) was a leap year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Silius Italicus and Trachalus, or the start of the Year of the Four Emperors. The denomination AD 68 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. These are now used throughout the world.

Salonia Matidia was the daughter and only child of Ulpia Marciana and wealthy praetor Gaius Salonius Matidius Patruinus. Her maternal uncle was the Roman emperor Trajan. Trajan had no children and treated her like his daughter. Her father died in 78 and Matidia went with her mother to live with Trajan and his wife, Pompeia Plotina.

Ulpia Marciana was the beloved elder sister of Roman Emperor Trajan and grandmother of empress Vibia Sabina the wife of Hadrian. Upon her death, her brother had her deified.

July 4 is the 185th day of the year in the Gregorian calendar; 180 days remain until the end of the year.