Title: Afonso, Duke of Porto
Content:  Infante D. Afonso of Braganza, Duke of Porto (31 July 1865 in Palace of Ajuda, Lisbon &ndash; 21 February 1920 in Naples, Italy) was a Portuguese Infante of the House of Braganza, the son of King Luis I of Portugal and his wife, Maria Pia of Savoy. From 1908 to the abolition of the Portuguese monarchy in 1910 he was the Prince Royal of Portugal as heir presumptive to his nephew, King Manuel II.
Title: Afonso, Prince of Beira
Content:  Dom Afonso de Santa Maria, Prince of Beira (born 25 March 1996) is a Portuguese prince and eldest son of Duarte Pio, Duke of Braganza, Head of the Portuguese Royal Family. As heir to his father, Afonso is styled as Prince of Beira and Duke of Barcelos and is first in the line of succession to the defunct Portuguese throne.
Title: Afonso, Prince Imperial of Brazil
Content:  Afonso was born at 13:35 on 23 February 1845 in the Palace of São Cristóvão, in Rio de Janeiro, Brazil. He was named after his ancestor Afonso, Duke of Braganza, son of King João I of Portugal and founder of the House of Braganza (Portuguese: Bragança). His full name was Afonso Pedro de Alcântara Cristiano Leopoldo Filipe Eugênio Miguel Gabriel Rafael Gonzaga. Through his father, Emperor Pedro II, he was a member of the Brazilian branch of the House of Braganza (Portuguese: Bragança) and was referred to using the honorific "Dom" (Lord) from birth. Afonso was the grandson of Emperor Pedro I of Brazil and nephew of Queen Maria II of Portugal. Through his mother, Teresa Cristina, he was a grandson of Francis I and nephew to Ferdinand II, who ruled as kings of the Two Sicilies 
Title: Afonso, Duke of Porto
Content:  III, 11 December 1886 (Spain) ; Knight of the Seraphim, 24 December 1883 (Sweden-Norway) ; Honorary Grand Cross of the Royal Victorian Order, 7 April 1903 (United Kingdom) His full name was Afonso Henrique Maria Luís Pedro de Alcântara Carlos Humberto Amadeu Fernando António Miguel Rafael Gabriel Gonzaga Xavier Francisco de Assis João Augusto Júlio Volfando Inácio de Saxe-Coburgo-Gotha e Bragança. Insofar as titles are concerned, Afonso was, first and foremost, Infante of Portugal. The Infante Afonso was born during the reign of his father, Luís I, and, at birth, he was granted the title, Duke of Porto. He became Prince 
Title: Afonso, Duke of Porto
Content:  legal heir in his last will. As the marriage, and the will, was legally disputed in Lisbon, Nevada was briefly arrested shortly after she arrived at Lisbon to claim her inheritance. Eventually, however, she proved a substantial portion of her claim, and she was officially granted the right to remove many objects of art and expensive goods from the Portuguese royal palaces. The 35-year-old former Duchess of Porto traveled to Portugal from Italy with the body of her late husband, and she arranged for its installation in the Braganza pantheon in the Monastery of São Vicente de Fora in Lisbon.
Title: Afonso I, Duke of Braganza
Content:  Historians believe he was born in Veiros, Estremoz, Alentejo, as a natural son of Portuguese King John I and Inês Peres. He married the heiress Beatriz Pereira de Alvim, daughter of Nuno Álvares Pereira, a general and the wealthiest man in the kingdom. A traveled and cultivated man, Afonso was present in 1415 when the Portuguese conquered Ceuta.
Title: Afonso of Lencastre
Content:  of Marquis of Porto Seguro. In spite of the Portuguese revolution of 1 December 1640, Afonso remained faithful to the Spanish Habsburgs. To reward his fidelity, King Philip IV granted him, by a decree issued on 23 March 1642, the new titles of Duke of Abrantes and Marquis of Sardoal. However, as Philip IV was no longer King of Portugal, these two titles were never recognise by the Portuguese authorities. D. Afonso was born in his family palace, in Azeitão (near Setúbal), Portugal, and, on 15 July 1627, he married a Spanish lady, Ana de Sande de Padilla, 2nd Marchioness of Valdefuentes. They had 4 children:
Title: Afonso, Prince of Beira
Content:  Afonso is first in the line of succession to the Portuguese Crown, as heir to his father, the Duke of Braganza.
Title: Afonso I, Duke of Braganza
Content:  When his half-brother, King Duarte I of Portugal, died in 1438, his son Afonso V (Afonso's nephew) was an infant and the choice of regent was his sister-in-law, the Queen Mother Eleonor of Aragon. This choice was not popular because Eleonor was Aragonese. Among the aristocracy, however — especially Afonso's inner circle —, Eleonor of Aragon was preferred. There were also doubts about Peter's political ability. At a meeting of the Portuguese Cortes summoned by Afonso's half-brother John, Lord of Reguengos de Monsaraz, the regency was awarded to the Infante Peter, Duke of Coimbra, another half-brother of Afonso and an uncle of the young king. 
Title: Afonso VI of Portugal
Content:  He succeeded his father (João IV) in 1656 at the age of thirteen. His mother, Luisa of Medina-Sidonia, was named regent in his father's will. His mental instability and paralysis, plus his lack of interest in government, left his mother as regent for six years, until 1662. Afonso oversaw decisive military victories over the Spanish at Elvas (14 January 1659), Ameixial (8 June 1663) and Montes Claros (17 June 1665), culminating in the final Spanish recognition of sovereignty of Portugal's new ruling dynasty, the House of Braganza, on 13 February 1668 in the Treaty of Lisbon.

Question: Who is the mother of Afonso, Duke of Oporto?
Answer: Maria Pia of Savoy.