Maria of Gothia
Maria of Gothia was the first wife of David of Trebizond, last Emperor of Trebizond, whom she married in 1426.
Theodora Kantakouzene (wife of Alexios IV of Trebizond)
Theodora Kantakouzene Megale Komnene (died 12 November 1426) was the Empress consort of Alexios IV of Trebizond.
Said to be very beautiful, according to the chronicle of Laonikos Chalkokondyles she was accused by her son, John Megas Komnenos, of having an affair with the "protovestiarios" of the court of Trebizond; however, other accounts describe her as a faithful and loving wife, who kept the peace between Alexios and his sons.
In either case, during her lifetime their son John fled to Georgia and did not return until after Theodora's death.
Guillaume de Saint-André
Guillaume de Saint- André( fl. 15th/ 16th centuries) was the secretary and biographer of John IV of Brittany.
Irene of Trebizond
Irene of Trebizond( died around 1382) was the bigamous wife of Basil of Trebizond, by whom he had two sons, Alexios and John( later Alexios III of Trebizond), and possibly three daughters Anna, Maria and Theodora.
Marie of Armagnac
Marie of Armagnac( c. 1420–1473) was a French noblewoman, daughter of John IV of Armagnac and his second wife, Isabella of Navarre.
Through her son, she would eventually become the great- grandmother of Henry IV of France.
Bagrationi, wife of John IV of Trebizond
Bagrationi( c. 1411/2 – before 1438) was the first Empress consort of John IV of Trebizond.
Her name is unknown.
John IV, Duke of Saxe-Lauenburg
John IV of Saxe- Lauenburg( *?– 1414*) was a son of Duke Eric IV of Saxe- Lauenburg and Sophia of Brunswick- Lüneburg.
Alexander of Trebizond
Alexander Komnenos or Skantarios Komnenos was a co-emperor of the Empire of Trebizond, first with his father Alexios IV of Trebizond then, after several years in exile, with his brother John IV.
John IV of Trebizond
John IV Megas Komnenos
(΄ Μέγας Κομνηνός, "Iōannēs IV Megas Komnēnos") (1403 – c.1459) was Emperor of Trebizond from 1429 until his death.
He was a son of Emperor Alexios IV of Trebizond and Theodora Kantakouzene.
John IV of Saxe-Lauenburg (prince-bishop)
John IV of Saxe- Lauenburg( c. 1483–1547) was a Prince- Bishop of Hildesheim.

Question: What is the date of death of John Iv Of Trebizond's mother?
Answer: 12 November 1426