Frei Francisco de São Luís, O.S.B. GCC (26 January 1766 – 7 May 1845), religious name of Francisco Manuel Justiniano Saraiva and today more commonly known as Cardinal Saraiva (Portuguese: Cardeal Saraiva), was a Portuguese Cardinal of the Catholic Church, who was the eighth Patriarch of Lisbon from 1840 (only preconised by the Holy See in 1843) to 1845. As a researcher and author, Cardinal Saraiva was an authority in the fields of Philology and History: his ten-volume Complete Works (published posthumously in 1856-1878) were standard reference works for more than a century.