Santiago Millet Jeangéante

Santiago Millet Saint-Jean (1796 – March 1838) was a French entrepreneur who settled in Costa Rica. Born in Libourne, Aquitaine, he was the son of Gabriel-Joseph de Millet and Marguerite Saint-Jean. In January 1827 he married Magdalena Castillo, daughter of former Vice Head of State and diplomat Mariano Montealegre Bustamante. They had three children: Napoleón Millet Castillo (coffee plantation owner), Luisa Millet Castillo (who married politician and lawyer Manuel Alvarado y Barroeta), and José Santiago Millet Castillo (hero of Costa Rica's 1856–1857 campaign against William Walker’s filibusters). After his death, his widow married Gregorio Escalante Nava.

In 1815 he moved to Martinique, and in the 1820s he established himself in Lima, Peru, where he engaged in trade. In 1826 he relocated to Costa Rica, focusing on commerce, brazilwood harvesting on the Nicoya Peninsula, and mining at Cerro Aguacate.

Millet became a naturalized Costa Rican citizen in 1830. He served as Mayor (President Municipal) of San José and was among the first Freemasons in Costa Rica.