Question: Who is Marcus Annius Libo's aunt?

Knowledge 1: Marcus Annius Libo
Marcus Annius Libo was a Roman Senator active in the early second century AD.He was consul in 128 as the colleague of Lucius Nonius Calpurnius Torquatus Asprenas.Libo was the paternal uncle of the Emperor Marcus Aurelius.Libo came from the upper ranks of the Roman aristocracy.He was the son of Marcus Annius Verus, consul III in 126, and Rupilia Faustina.Annius Verus was Spanish of Roman descent.Rupilia was the daughter of Lucius Scribonius Libo Rupilius Frugi Bonus and Salonina Matidia (niece of the Emperor Trajan).Libo is known to have three siblings, two sisters and one brother.His elder sister was the Empress Faustina the Elder (mother of the Empress Faustina the Younger) and his younger sister (whose name is missing, but surmised to be "Annia") was the wife of Gaius Ummidius Quadratus Sertorius Severus, suffect consul in 118.His brother was Marcus Annius Verus, the father of Marcus Aurelius.Beyond his consulship, almost nothing is known of his senatorial career.During the reign of his brother-in-law, Antoninus Pius, he was one of seven witnesses to a Senatus consultum issued to the city of Cyzicus in 138, which sought approval for establishing a "corpus juvenum" for the education of young men. [SEP] Knowledge 2: Rupilia
Rupilia Faustina (c. 87 A.D. – before 138 A.D.) was an influential Roman noblewoman.She was the daughter of Salonina Matidia and suffect consul Lucius Scribonius Libo Rupilius Frugi Bonus.She possibly had another sister called Rupilia Annia.Her mother’s maternal uncle was the Roman Emperor Trajan.Her elder half-sisters were Roman Empress Vibia Sabina and Matidia Minor.The sisters lived and were raised as a part of the household of Trajan, his wife Pompeia Plotina and her father.Roman Emperor Hadrian was her brother-in-law and third cousin.Faustina married Marcus Annius Verus, who was a prefect in Rome and served as consul three times.Their children were:
Knowledge 1: Marcus Annius Libo
Marcus Annius Libo was a Roman Senator active in the early second century AD.He was consul in 128 as the colleague of Lucius Nonius Calpurnius Torquatus Asprenas.Libo was the paternal uncle of the Emperor Marcus Aurelius.Libo came from the upper ranks of the Roman aristocracy.He was the son of Marcus Annius Verus, consul III in 126, and Rupilia Faustina.Annius Verus was Spanish of Roman descent.Rupilia was the daughter of Lucius Scribonius Libo Rupilius Frugi Bonus and Salonina Matidia (niece of the Emperor Trajan).Libo is known to have three siblings, two sisters and one brother.His elder sister was the Empress Faustina the Elder (mother of the Empress Faustina the Younger) and his younger sister (whose name is missing, but surmised to be "Annia") was the wife of Gaius Ummidius Quadratus Sertorius Severus, suffect consul in 118.His brother was Marcus Annius Verus, the father of Marcus Aurelius.Beyond his consulship, almost nothing is known of his senatorial career.During the reign of his brother-in-law, Antoninus Pius, he was one of seven witnesses to a Senatus consultum issued to the city of Cyzicus in 138, which sought approval for establishing a "corpus juvenum" for the education of young men. [SEP] Knowledge 2: Annia Fundania Faustina
Annia Fundania Faustina( died 192) was a noble Roman woman who lived in the Roman Empire during the 2nd century AD.She was the paternal cousin of Roman Emperor Marcus Aurelius and his sister Annia Cornificia Faustina.Fundania Faustina was the daughter of the Roman Consul Marcus Annius Libo and Fundania.Her brother was the younger Marcus Annius Libo who served as governor of Syria in 162.Fundania Faustina ’s maternal grandparents are unknown; however her paternal grandparents are the Roman consul Marcus Annius Verus and Rupilia Faustina.She was born and raised in Rome.Through her paternal grandmother, she was related to the ruling Nerva– Antonine dynasty of the Roman Empire.Her paternal aunt was Empress Faustina the Elder( wife of Emperor Antoninus Pius and mother of Empress Faustina the Younger) and her paternal uncle was praetor Marcus Annius Verus( father of Emperor Marcus Aurelius, the paternal grandmother of Empress Lucilla and Emperor Commodus).Fundania Faustina, married the Roman Politician Titus Pomponius Proculus Vitrasius Pollio.She bore him two children who were: Before 180, her husband had died and Fundania Faustina never remarried.During the reign of her unstable paternal cousin Commodus( 180- 192), she decided to withdraw from public life and chose to live in retirement in Achaea.Before he was asassinated in 192, Commodus ordered Fundania Faustina ’s death and she was later executed in that year.
Knowledge 1: Marcus Annius Libo
Marcus Annius Libo was a Roman Senator active in the early second century AD.He was consul in 128 as the colleague of Lucius Nonius Calpurnius Torquatus Asprenas.Libo was the paternal uncle of the Emperor Marcus Aurelius.Libo came from the upper ranks of the Roman aristocracy.He was the son of Marcus Annius Verus, consul III in 126, and Rupilia Faustina.Annius Verus was Spanish of Roman descent.Rupilia was the daughter of Lucius Scribonius Libo Rupilius Frugi Bonus and Salonina Matidia (niece of the Emperor Trajan).Libo is known to have three siblings, two sisters and one brother.His elder sister was the Empress Faustina the Elder (mother of the Empress Faustina the Younger) and his younger sister (whose name is missing, but surmised to be "Annia") was the wife of Gaius Ummidius Quadratus Sertorius Severus, suffect consul in 118.His brother was Marcus Annius Verus, the father of Marcus Aurelius.Beyond his consulship, almost nothing is known of his senatorial career.During the reign of his brother-in-law, Antoninus Pius, he was one of seven witnesses to a Senatus consultum issued to the city of Cyzicus in 138, which sought approval for establishing a "corpus juvenum" for the education of young men. [SEP] Knowledge 2: Kawamura Sumiyoshi
Count, was an admiral in the Imperial Japanese Navy.Kawamura's wife Haru was the aunt of Saigō Takamori.

Answer: Vibia Sabina