What is "sant'eustachio"

Sant'Eustachio is the VIII rione of Rome, named after the eponymous church, located in Municipio I of the city. Its logo is the head of a stag with a cross between the antlers (symbol of Saint Eustace): the figure is golden on a red background.

Sant'Eustachio is a Roman Catholic titular church and minor basilica in Rome, named for the martyr Saint Eustace. It is located on Via di Sant'Eustachio in the rione Sant'Eustachio, a block west of the Pantheon and via della Rotonda, and a block east of Sant'Ivo alla Sapienza and the Via della Dogana Vecchia.