John, Prince of Portugal (1451)
John, Prince of Portugal was a Portuguese infante, son of Afonso V and Isabella of Coimbra.
He was born heir to the throne in 1451, but he died young during the same year.
The title of Prince of Portugal then passed again to Infante Ferdinand, Duke of Viseu, his uncle.
João de Lencastre, 1st Duke of Aveiro
João de Lencastre(?, 1501 – Coimbra, 1571), was the older son of Infante George, Duke of Coimbra and of his wife" Dona" Beatriz of Vilhena.
Through his father, John was a grandchild of King John II of Portugal and a 3rd cousin to King Manuel I of Portugal.
Through his mother, daughter of Álvaro of Braganza( 4th male son of Fernando I, 2nd Duke of Braganza), John of Lencastre was close related to the most prestigious aristocratic families of the Kingdom( namely the Duke of Braganza, the Marquis of Ferreira, the Marquis of Vila Real, the Count of Vimioso, the Count of Portalegre).
When he was 12 years old, he served crown prince John( who became later King John III of Portugal) and King Manuel I granted him the title of Marquis of Torres Novas by a royal decree issued on March 27, 1520.
In that time, the royal house announced the marriage of Infante Ferdinand, Duke of Guarda( King Manuel I younger son) to the richest and prestigious heir" Dona" Guiomar Coutinho, 5th Countess of Marialva and the 3rd Countess of Loulé.
However, John of Lencastre declared he had secretly married the richest bride.
The scandal in the Court ended when King John III ordered the Marquis imprisonment in the Castle of São Jorge, in Lisbon, allowing the celebration of the Infante Ferdinand's marriage.
After nine years, when he was released, he went to live in Setúbal, maybe ashamed for the situation, and he only returned to the Court in 1535, to escort Infante Luis, Duke of Beja, who was leading the Portuguese fleet in Charles V ’s crusade against Tunis.
In that year King John III granted him the title of Duke of Aveiro.
After his return from Madrid, in 1537( where he was sent by King John III to present formal condolences to Charles V, when his wife, Empress Isabel of Portugal, died) John of Lencastre, 1st Duke of Aveiro, decided to marry to" Dona" Juliana de Lara, daughter of the 3rd Marquis of Vila Real.
In 1552, he was again chosen by the King to escort, from the border to Lisbon, the Infanta Joan of Spain, who would marry John, Crown Prince of Portugal( John III only surviving son).
John of Lencastre and Juliana de Lara had two sons: John of Lencastre wrote several books and built a magnificent convent in Arrábida, near Setúbal, where an annual music festival takes place.
Diogo, Duke of Viseu
Infante Diogo of Viseu( 1450 – 1484) was the second son of Ferdinand, Duke of Viseu, and his wife Beatriz, Duchess of Viseu.
Ferdinand, Duke of Viseu
Infante Ferdinand, Duke of Viseu and Beja( or" Fernando,", 1433 – 1470) was the third son of Edward, King of Portugal and his wife Eleanor of Aragon.
Manuel Vieira de Matos
Manuel Vieira de Matos (22 March 1861 – 28 September 1932) was Bishop of Guarda, Archbishop of Braga, and the founder of the Corpo Nacional de Escutas - Escutismo Católico Português.
He was born in Poiares, Peso da Régua.
On 1 April 1903 he became the Bishop of Guarda, and on 1 October 1914 he became Archbishop of Braga.
In Braga in 1923, Manuel Vieira de Matos and Dr. Avelino Gonçalves founded the largest Scouting organization in Portugal, the Corpo Nacional de Escutas - Escutismo Católico Português (CNE).
In 1929 the organization was accepted as member by the World Scout Bureau.
He died in Braga, Portugal.
Fernando Afonso de Albuquerque
Fernando Afonso de Albuquerque( 1327-1387) was a Portuguese nobleman, alcaide da Guarda, and Ambassador of England.
Frederick Charles Ferdinand, Duke of Brunswick-Lüneburg
Frederick Charles Ferdinand, Duke of Brunswick- Lüneburg( 5 April 1729 in Brunswick – 27 April 1809 in Glücksburg), was a member of the House of Guelph.
he was a Danish field marshal and also the last Duke of Brunswick- Bevern.
Maria of Aragon, Queen of Portugal
Maria of Aragon (29 June 1482 – 7 March 1517) was a Spanish infanta, and queen consort of Portugal as the second spouse of Portuguese King Manuel I.
Ferdinand of Portugal, Duke of Guarda
Ferdinand of Portugal, Duke of Guarda, (5 June 1507 – 7 November 1534) was a Portuguese "infante" (prince), the son of King Manuel I of Portugal and his second wife, Maria of Aragon.
Amador of Portugal
Saint Amador of Portugal, whose feast day is celebrated on 27 March, was a hermit in Portugal.
Several churches in the diocese of Guarda and elsewhere in Portugal are dedicated to him.

Question: What nationality is Ferdinand Of Portugal, Duke Of Guarda's mother?
Answer: Spanish