Hospital Maciel is one of the oldest hospitals in Uruguay and stands on the block bounded by the streets Maciel, 25 de Mayo, Guaraní and Washington, with the main entrance at 25 de Mayo, 172. The land was originally donated in Spanish colonial times by philanthropist Francisco Antonio Maciel, who teamed up with Mateo Vidal to establish a hospital and charity. The first building was constructed between 1781 and 1788 and later expanded upon. The present building stems from the 1825 plans of José Toribio (son of Tomás Toribio) and later Bernardo Poncini (wing on the Guaraní street, 1859), Eduardo Canstatt (corner of Guaraní and 25 de Mayo) and Julián Masquelez (1889). The hospital has a chapel built in Greek style by Miguel Estévez in 1798.

Answer this question, if possible (if impossible, reply "unanswerable"): Who originally donated the land for Hospital Macie?
Francisco Antonio Maciel