Jacobo Sedelmayr (1702–1779) was a Jesuit missionary in New Spain, known for his explorations of the Pimería Alta.
[2] He embarked from El Puerto de Santa María for Mexico on November 22, 1735, along with more than forty other Jesuits.
His ship, the Santa Rosa, ran aground off San Juan de Ulúa on February 18, 1736, and the group of Jesuits proceeded on land to Mexico City by way of Pueblo de Los Ángeles.
[3] After the 1751 Pima Revolt, Sedelmayr was removed from the Pimería Alta as one of Luis Oacpicagigua's peace conditions.
[5] Sedelmayr also explored the entire length of the Gila River,[1][5] and advocated for expanding the Spanish missions all the way to its shores.