Francisco Javier Sentmenat, 5th Marquis of Casteldosrius

Francisco Javier Sentmenat Oms y Vera de Santa Pau, 5th Marquis of Casteldosrius (7 January 1767 – 1 February 1842), was a Spanish army officer and senator.

Early career In 1777, at the age of ten, he enlisted as a cadet in the Alcantara Cavalry Regiment, of which his father was the colonel. Two years later, he was attached as an ensign to the King's Dragoon Regiment before returning, the following year to his original unit as a Cavalry ensign. In 1781, at the age of 14, he was promoted to captain. Taken prisoner to France, he returned to Spain in May 1814.

Post-war career On his return to Spain, in 1814, Ferdinand VI promoted Casteldosrius to field marshal and he served under Castaños, Duke of Bailén, in the Observation Army of the Right (Ejército de Observación de la Derecha) during the Hundred Days (March–July 1815). He was then appointed captain-general of Andalusia and given command of Cadiz. In 1819, he left that posting on being promoted to lieutenant general, colonel of the 2nd Regiment of the Guardias de Infantería Española and a member of the Supreme War Council.

Following Rafael del Riego's 1820 pronunciamiento, Casteldosrius declared himself on favour of the Constitution and was confirmed in his command of the 2nd Regiment until his appointment, in February 1822, as Captain General of Catalonia. Following the uprising of the Royal Guard on July 1822, he was appointed commander-in-chief of Madrid in August and governor that November.

When the Hundred Thousand Sons of Saint Louis invaded Spain, Casteldosrius was appointed second-in-command to Enrique O'Donnell, Conde de La Bisbal, whom he substituted when O'Donnell was dismissed. Having deployed his troops in Talavera and Almaraz, he was appointed governor of Badajoz in May 1823.

With the restoration of Ferdinand VII's absolutist monarchy, Casteldosrius was dispossed of all his ranks and military decorations and sentenced to eight years' imprisonment, which he served in the castle of Olivenza, Cáceres and the castle on San Antón, where he remained until the king's death in 1833.

In 1834, the Queen Regent restored his ranks and in 1836 he was appointed interim captain general of Galicia and then Director General of Artillery, post he held until 1840. In 1841 and 1842, he was senator for Barcelona.