Maria of Portugal, Duchess of Viseu
Maria of Portugal, Duchess of Viseu (18 June 1521 – 10 October 1577 in Lisbon) was an Infanta of Portugal, the only daughter of King Manuel I of Portugal and Eleanor of Austria.
A noted patron of the arts, Maria's personal wealth rivaled that of the king, her brother (John III of Portugal), making her the richest woman in Portugal and one of the richest in Europe.
Beatrice of Swabia
Beatrice or Beatrix of Swabia( April/ June 1198 – 11 August 1212), a member of the Hohenstaufen dynasty, was Holy Roman Empress and German Queen in 1212 as the first wife of the Welf emperor Otto IV.
She was also the shortest- serving Holy Roman Empress, dying three weeks into her marriage.
Afonso, Prince of Portugal (1526)
Afonso, Prince of Portugal was the first son of king John III of Portugal and his queen, Catherine of Austria.
He was the Prince of Portugal but died in the same year he was born, in 1526.
Eleanor of Aragon, Queen of Portugal
Eleanor of Aragon (2 May 1402 – 19 February 1445) was queen consort of Portugal as the spouse of Edward I of Portugal and the regent of Portugal as the guardian of her son.
She was the daughter of Ferdinand I of Aragon and Eleanor of Alburquerque.
Eleanor of Viseu
Eleanor of Viseu( 2 May 1458 – 17 November 1525) was a Portuguese" infanta"( princess) and later queen consort of Portugal.
To distinguish her from other infantas of the same name, she is commonly known as Eleanor of Viseu( after her father's title) or Eleanor of Lancaster(" Lancaster", a name used by some Portuguese royals after her great- grandmother Queen Philippa of Lancaster).
In Portugal, she is known universally as" Rainha Dona Leonor".
She is considered one of the most notable Portuguese queen consorts.
She was the second of only two queen consorts of Portugal who were not foreigners.
Eleanor of England, Countess of Leicester
Eleanor of England( also called Eleanor Plantagenet and Eleanor of Leicester)( 1215 – 13 April 1275) was the youngest child of John, King of England and Isabella of Angoulême.
Adelaide of Italy
Adelaide of Italy (93116 December 999 AD) , also called Adelaide of Burgundy, was a Holy Roman Empress by marriage to Holy Roman Emperor Otto the Great; she was crowned as the Holy Roman Empress with him by Pope John XII in Rome on 2 February 962.
She was regent of the Holy Roman Empire as the guardian of her grandson in 991-995.
Eleanor of Portugal, Holy Roman Empress
Eleanor of Portugal (18 September 1434 – 3 September 1467) was Empress of the Holy Roman Empire.
A Portuguese "infanta" (princess), daughter of King Edward of Portugal and his wife Eleanor of Aragon, she was the consort of Holy Roman Emperor Frederick III and the mother of Holy Roman Emperor Maximilian I.
Elisabeth Christine of Brunswick-Wolfenbüttel
Elisabeth Christine of Brunswick- Wolfenbüttel( 28 August 1691 – 21 December 1750) was Princess of Brunswick- Wolfenbüttel, Holy Roman Empress, German Queen, Queen of Bohemia and Hungary; and Archduchess of Austria by her marriage to Emperor Charles VI.
She was renowned for her delicate beauty and also for being the mother of Empress Maria Theresa.
She was the longest serving Holy Roman Empress.
Aimery I, Viscount of Châtellerault
Aimery I de Châtellerault( – 7 November 1151), was the Viscount of Châtellerault and father of Aenor de Châtellerault.
Through his daughter he was the grandfather of Eleanor of Aquitaine, successively queen of France and England.

Question: Who is the maternal grandfather of Eleanor Of Portugal, Holy Roman Empress?