Capilla de San Gregorio de Osset Monument · Alcalá del Río, Vega del Guadalquivir, Seville Chapel founded by the Catholic Monarchs in 1485 in honor of San Gregorio Osetano (of Osset), a local bishop venerated since ancient times, with an altarpiece from 1770 dedicated to the saint. n/a Photo: CarlosVdeHabsburgo (CC BY-SA 4.0) What to see and do in Alcalá del Río