Faustina the Younger
Annia Galeria Faustina Minor ("Minor" is Latin for "the Younger"), Faustina Minor or Faustina the Younger (born probably 21 September CE, — 175/176 CE)
was a daughter of Roman Emperor Antoninus Pius and Roman Empress Faustina the Elder.
She was a Roman Empress and wife to her maternal cousin Roman Emperor Marcus Aurelius.
She was held in high esteem by soldiers and her own husband and was given divine honours after her death.
Doria Ragland
Doria L. Ragland( born September 2, 1956) is the mother of Meghan, Duchess of Sussex, the mother- in- law of Prince Harry, and the maternal grandmother of Archie Mountbatten- Windsor, who is seventh in line to the British throne.
She is a former makeup artist, business owner, yoga instructor, and former social worker who worked in the mental health sector from 2015 to 2018.
Vera Miletić
Vera Miletić (Serbian Cyrillic: Вера Милетић; 8 March 1920 – 7 September 1944) was a Serbian student and soldier.
She was notable for being the mother of Mira Marković, posthumously making her the mother-in-law of Serbian president Slobodan Milošević.
Eldon Howard
Eldon Howard was a British screenwriter.
She was the mother- in- law of Edward J. Danziger and wrote a number of the screenplays for films by his company Danziger Productions.
Priscilla Pointer
Priscilla Marie Pointer( born May 18, 1924) is an American stage, film and television character actress.
She began her career in the theater, including productions on Broadway.
Later, Pointer moved to Hollywood to act in films and on television.
She is the mother of Amy Irving, therefore making her the former mother- in- law of filmmakers Steven Spielberg and Bruno Barreto and the mother- in- law of documentary filmmaker Kenneth Bowser, Jr.
Marian Shields Robinson
Marian Lois Robinson( née Shields; born July 29, 1937) is the mother of Michelle Obama, former First Lady of the United States, and Craig Robinson, a basketball executive, and the mother- in- law of former U.S. President Barack Obama.
Scribonia (wife of Octavian)
Scribonia( c. 70 BC – c. 16 AD) was the second wife of Octavian, later the Roman Emperor Augustus, and the mother of his only natural child, Julia the Elder.
Through her youngest daughter she was the mother- in- law of the Emperor Tiberius, great- grandmother of the Emperor Caligula and Empress Agrippina the Younger, and great- great grandmother of the Emperor Nero.
Maria Thins
Maria Thins( c. 1593 – 27 December 1680) was the mother- in- law of Johannes Vermeer and a member of the Gouda Thins family.
Baroness Gösta von dem Bussche-Haddenhausen
Baroness Gösta von dem Bussche- Haddenhausen( 26 January 1902 – 13 June 1996) was the mother of Prince Claus of the Netherlands, who was the Prince Consort of Queen Beatrix of the Netherlands, thus making her the mother- in- law of the former Dutch Queen.
She is also the paternal grandmother of King Willem- Alexander of the Netherlands, who is the current Dutch King.
Marcus Aurelius
Marcus Aurelius (or ; ; 26 April 121 – 17 March 180) was Roman emperor from 161 to 180 and a Stoic philosopher.
He was the last of the rulers known as the Five Good Emperors, and the last emperor of the Pax Romana, an age of relative peace and stability for the Roman Empire.
He served as Roman consul in 140, 145, and 161.
The son of the praetor Marcus Annius Verus (III) and the wealthy heiress Domitia Lucilla, Marcus was raised by his mother and by his grandfather, Marcus Annius Verus (II), after his father died.
His uncle, Antoninus Pius, adopted him shortly before becoming emperor in 138.
Now heir to the throne, Marcus studied Greek and Latin under tutors such as Herodes Atticus and Marcus Cornelius Fronto.
He kept in close correspondence with Fronto for many years afterwards.
Marcus married Antoninus' daughter Faustina in 145.
Antoninus died following an illness in 161.
The reign of Marcus Aurelius was marked by military conflict.
In the East, the Roman Empire fought successfully with a revitalized Parthian Empire and the rebel Kingdom of Armenia.
Marcus defeated the Marcomanni, Quadi, and Sarmatian Iazyges in the Marcomannic Wars; however, these and other Germanic peoples began to represent a troubling reality for the Empire.
He modified the silver purity of the Roman currency, the denarius.
The persecution of Christians in the Roman Empire is believed to have increased during his reign.
The Antonine Plague broke out in 165 or 166 and devastated the population of the Roman Empire, causing the deaths of five million people.
Unlike some of his predecessors, Marcus chose not to adopt an heir.
His children included Lucilla (who married Lucius Verus, co-emperor from 161 to 169) and Commodus, whose succession after Marcus has become a subject of debate among both contemporary and modern historians.
The Column and Equestrian Statue of Marcus Aurelius still stand in Rome, where they were erected in celebration of his military victories.
"Meditations", the writings of "the philosopher" – as contemporary biographers called Marcus, are a significant source of the modern understanding of ancient Stoic philosophy.
They have been praised by fellow writers, philosophers, monarchs, and politicians centuries after his death.

Question: Who is the mother-in-law of Faustina The Younger?
Answer: Domitia Lucilla