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.
Guillaume de Saint-André
Guillaume de Saint- André( fl. 15th/ 16th centuries) was the secretary and biographer of John IV of Brittany.
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 of Saxe-Lauenburg (prince-bishop)
John IV of Saxe- Lauenburg( c. 1483–1547) was a Prince- Bishop of Hildesheim.
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.
Alexios IV of Trebizond
Alexios IV Megas Komnenos or Alexius IV (1382–1429), Emperor of Trebizond from 5 March 1417 to October 1429.
He was the son of Emperor Manuel III and Gulkhan-Eudokia of Georgia.
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.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
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.
Maria of Gothia
Maria of Gothia was the first wife of David of Trebizond, last Emperor of Trebizond, whom she married in 1426.

Question: Who is the paternal grandmother of John Iv Of Trebizond?
Answer: Gulkhan-Eudokia of Georgia