The Accademia Nazionale di Santa Cecilia is one of the oldest musical institutions in the world, founded by the papal bull Ratione congruit, issued by Sixtus V in 1585, which invoked two saints prominent in Western musical history: Gregory the Great, for whom the Gregorian chant is named, and Saint Cecilia, the patron saint of music. Since 2005 it has been headquartered at the Renzo Piano designed Parco della Musica in Rome.