Analysis of information sources in references of the Wikipedia article "Francisco Xavier de Mendonça Furtado" in English language version.
(See Romeiras, Francisco Malta. Jesuits and the Book of Nature: Science and Education in Modern Portugal. Brill, 2019. p. 24. doi:https://doi.org/10.1163/9789004382367_00 ISBN 9789004382367 Accessed 20 January 2024."From the 1750s, this powerful secretary of state to King José (1714–77, r.1750–77) promoted his relatives — including his younger brothers Paulo de Carvalho e Mendonça (1702–70) and Francisco Xavier de Mendonça Furtado (1701–69) — to the most prominent ecclesiastical, diplomatic, and political positions in the Portuguese Empire. They played a direct role in Pombal’s battles with the Jesuits, and their activities greatly increased the wealth of the Carvalho family."
"The whole Court was in Vila Viçosa in the month of November, with the exception of the young Prince of Beira, who had been left in Lisbon under the guard of his governors, the Marquis d'Alvitto and the Countess de Pombeiro. Count d'Oeiras had remained in the capital, to watch closely the general progress of affairs. However, feeling the need to take a little rest he went to spend a few days at his property of Oeiras, and absolutely wanted to take the young Prince, whatever needed to be said to him to convince the Marquis and Countess in charge of the guard of this august Child. They did not ignore what they feared, that is exposing themselves to the vengeance of this implacable Minister; however, they thought that they should not set aside informing their Majesties immediately of this event. The King paid little attention to it; but the Queen was so angry with Carvalho that, having met his brother Mendonça, she crushed him with the harshest reproaches, and made him bear all the weight of her resentment. Mendonça in despair, retired to his apartment, where he was seized with a fever so violent, that it took him away after three days." (See Gusta. Mémoires du Sébastien-Joseph Carvalho e Melo, Comte d'Oyeras, Marquis de Pombal, Secrétaire d'Etat et Premier Ministre du Roi de Portugal Joseph I. (Memoirs of Sebastião José de Carvalho e Melo, Count of Oeiras, Marquis of Pombal, Secretary of State and Prime Minister of the King of Portugal José I.) Vol. 3. 1784. pp. 144–145. [22] (in French). Accessed 13 January 2019.)