Matidia Empress of the Roman Empire from 29 August 112 to 119.
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 who had no children and treated her like his daughter. She often traveled with her uncle and assisted him with decision-making. On August 29, 112, she received the title of Augusta upon the death and divinization of Marciana.

Between 81 and 82, Matidia married a suffect consul and former proconsul Lucius Vibius Sabinus. She bore Sabinus a daughter called Vibia Sabina, who would marry the future Roman Emperor Hadrian

When she died in 119, Emperor Hadrian delivered her funeral oration, deified her, and granted her a temple and altar in Rome itself.
An AR Denarius struck AD 112 in Rome
Obverse: MATIDIA AVG DIVAE MARCIANAE F, draped bust of Matidia right, wearing double stephane

Reverse: PIETAS AVGVST, Matidia as Pietas standing facing, head left, her hands resting on the heads of two children standing at her feet

Diameter: 19 mm
Die Orientation: 7 H
Weight: 3.34 g
A niece of the Emperor Trajan, Salonia Matidia was the daughter of C. Salonius Matidius Patruinus (a senator from Vicetia) and the emperor's sister Ulpia Marciana. Matidia was twice married and was the mother of two daughters, Matidia and Sabina, the latter being the wife of the future emperor Hadrian. Trajan had a great affection for his niece and she often accompanied him on his travels. Following the death of her mother in 112 AD Matidia took her place as Augusta. This rare and attractive denarius of the recently elevated empress Matidia has a charming portrait showing the elaborate hair style popular with society ladies in the early decades of the 2nd century. The reverse depicts the empress in the guise of the goddess Pietas in an affectionate pose with two children, both female, doubtless representing her own two daughters Matidia and Sabina. Hadrian, like his predecessor, appears to have held Matidia in the very highest regard. On her death in 119 AD Hadrian personally pronounced the funeral oration, erected a temple in Rome to his mother-in-law's memory, and issued a coinage in precious metal in honor of the diefied Matidia.
RIC 759 (Trajan); BMC 661; RSC 10; Sear 3378