Marquess of San Felipe (Spanish: Marqués de San Felipe; Italian: Marchese di San Filippo), was a hereditary title in the Peerage of Spain and Peerage of Sardinia, granted in 1709 by Philip V to Vicente Bacallar y Sanna, a Sardinian historian of Valencian origin who served as ambassador in the Spanish Netherlands and the Republic of Genoa[1] The title became extinct in 1983[2] and is currently held in pretence by Vincenzo Amat di San Filippo, an Italian from Alghero.a Vicente Bacallar y Sanna (as in the Spanish and Sardinian use, with both the father's and the mother's surnames) was a military officer and politician who supported Philip of Anjou, the heir appointed by the last Habsburg king Charles II, in the War of the Spanish Succession.

Bacallar's only surviving issue was his daughter Maria Josefa, who married Francisco Amat of an ancient and distinguished Sardinian house of Catalan origin, son of the Marquess of Villarios.

In accordance with Spanish and Sardinian succession rules at that time, she inherited the titles and has transmitted them to her issue.

Amat firstborn (the eldest male) has brought the title of Marquess of St. Philip since (the Viscountcy being laid down, although no formal act of disclaimer has ever been issued), and they were recognized as such in Italian official registers until the Italian Republic ceased to recognize nobility titles.

Sources:[3][4] Present holder is a nephew of the latter, also called Vincenzo, with his younger brother as heir presumptive.