Birth. April 3, 1703, Barcelona, Spain. From an aristocratic family related to the House of Austria. Tenth of the eleven children of Juan Antonio de Boxadors y de Pinós, count of Savallá and Peralada, and his first wife, Dionisia de Sureda de San Martín. The other siblings were María Teresa, María Gracia, Bernat Antonio, Josep, five children who died in infancy, and Josefa. He had a half-sister, Maria Antonia, from his father's second wife, Xaviera von Berg. His first name is also listed as Ioannes Thomas; and as Joan-Tomas; and his last name as Boixadors; and Boxadors y Sureda de San Martín.

Early life. Served in the Austrian navy. Member of the Academy of Literature of Barcelona, 1729.

Education. Entered the Order of Preachers (Dominicans), 1734.

Priesthood. Ordained (no information found). In his order, prior of the convent of Santa Catalina, Barcelona; provincial of Aragón, April 30, 1746; master general, July , 1756 to May 1777.

Cardinalate. Created cardinal priest in the consistory of November 13, 1775; received the red hat on November 16, 1775; and the title of S. Sisto, December 18, 1775. Granted a dispensation to continue as master general after having been created cardinal, November 24, 1775. Ascribed to the SS. CC. of the Holy Office, Examination of Bishops and Index. Protector of the Order of Preachers, November 15, 1780.

Death. December 16, 1780, Rome. Exposed in the church of S. Maria sopra Minerva, Rome, where the funeral took place; his body was privately transferred to and buried in his title, S. Sisto (1).

Bibliography. Moroni, Gaetano. Dizionario di erudizione storico-ecclesiastica da S. Pietro sino ai nostri giorni. 103 vols. in 53. Venezia : Tipografia Emiliana, 1840-1861, VI, 82-83; Ritzler, Remigium, and Pirminum Sefrin. Hierarchia Catholica Medii et Recientoris Aevi. Volumen VI (1730-1799). Patavii : Typis et Sumptibus Domus Editorialis "Il Messaggero di S. Antonio" apud Basilicam S. Antonii, 1968, pp. 31 and 49; Weber, Christoph and Becker, Michael. Genealogien zur Papstgeschichte. 6 v. Stuttgart : Anton Hiersemann, 1999-2002. (Päpste und Papsttum, Bd. 29, 1-6), V, 107.