Ottaviano Nonni called Il Mascherino, was an Italian architect, sculptor, and painter born in Bologna

Bologna

Bologna is the capital city of Emilia-Romagna, in the Po Valley of Northern Italy. The city lies between the Po River and the Apennine Mountains, more specifically, between the Reno River and the Savena River. Bologna is a lively and cosmopolitan Italian college city, with spectacular history,...

. Apprentice of Giacomo Barozzi da Vignola

Giacomo Barozzi da Vignola

Giacomo Barozzi da Vignola was one of the great Italian architects of 16th century Mannerism. His two great masterpieces are the Villa Farnese at Caprarola and the Jesuits' Church of the Gesù in Rome...

, he was active in Emilia

Emilia (region of Italy)

Emilia is a historical region of northern Italy which approximately corresponds to the western and north-eastern portions of today’s Emilia-Romagna region...

 and in Rome

Rome

Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

, where he had been living in the rione

Rione

Rione is the name given to a ward in several Italian cities, the best-known of which is Rome. Unlike a quartiere, a rione is usually an official administrative subdivision...

 of Borgo

Borgo (rione of Rome)

Borgo , is the 14th historic district of Rome, Italy. It lies on the west bank of the Tiber, and has a trapezoidal shape. Its coat of arms shows a lion , lying in front of three mounts and a star...

, in the road still bearing his name (Via del Mascherino).

He was the architect of the Quirinal Palace

Quirinal Palace

The Quirinal Palace is a historical building in Rome, Italy, the current official residence of the President of the Italian Republic. It is located on the Quirinal Hill, the tallest of the seven hills of Rome...

 under Pope Gregory XIII

Pope Gregory XIII

Pope Gregory XIII , born Ugo Boncompagni, was Pope from 1572 to 1585. He is best known for commissioning and being the namesake for the Gregorian calendar, which remains the internationally-accepted civil calendar to this date.-Youth:He was born the son of Cristoforo Boncompagni and wife Angela...

. His other works include the churches of San Salvatore in Lauro

San Salvatore in Lauro

San Salvatore in Lauro is a Catholic church in central Rome, Italy, located in the rione Ponte. It is the "national church" of the marchigiani, the inhabitants of the Marche region of Italy...

 (1591), Santa Maria in Transpontina, the Bandini Chapel in San Silvestro al Quirinale

San Silvestro al Quirinale

San Silvestro al Quirinale is a historic church in central Rome, Italy.-History:The first mentions of a church on the site are from 1039, when it was called Santo Stefano in Cavallo in recognition of its site on Monte Cavallo, a small hill in the Campo Marzio.In 1507, the church was granted to the...

, ad the oval plan-design for the church of Spirito Santo dei Napoletani.

He died in Rome in 1606.