Question: Who was the father of the artist from a town and "comune" of Italy in the Province of Perugia in the Umbria region who learned to paint in the workshop of Cesare Nebbia, primarily moving between Orvieto and Rome ?

Context articles: Orvieto DOC
Deruta
Cesare Nebbia
Città di Castello
Umbria Jazz Festival
Pettino
Cesare Sermei
Province of Perugia
Perugia railway station
Assisi

Orvieto is an Italian wine region located in Umbria and Lazio, centered on the "comune" of Orvieto.
 It is primarily known for its white wines made from a blend of mostly Grechetto and Trebbiano, which is sold under the "Denominazione di origine controllata" (DOC) "Orvieto" and "Orvieto Classico".
 Blended red wine and eight varietal reds are sold under the Rosso Orvietano DOC.
 The region has been producing wine since the Middle Ages, when Orvieto wine was known as a sweet, golden-yellow wine.
 Today's white Orvieto is dry, but a semi-sweet style, known as "Orvieto Abboccato", and "dolce" (sweet), are also produced in small quantities.
Deruta is a hill town and "comune" in the Province of Perugia in the Umbria region of central Italy.
 Long known as a center of refined maiolica manufacture, Deruta remains known for its ceramics, which are exported worldwide.
Cesare Nebbia (c.1536–c.1622) was an Italian painter from Orvieto who painted in a Mannerist style.
Città di Castello (] ) is a city and "comune" in the province of Perugia, in the northern part of the Umbria region of Italy.
 It is situated on a slope of the Apennines, on the flood plain of the river Tiber.
 The city is 56 km north of Perugia and 104 km south of Cesena on the SS 3 bis.
 It is connected to the A1 highway by the SS 73 from Arezzo (17 mi).
 Città di Castello has an exclave named Monte Ruperto within Marche.
The Umbria Jazz Festival is one of the most important jazz festivals in the world and has been held annually since 1973, usually in the month of July, in Perugia, and surrounding cities of the region of Umbria Italy.
 Furthermore, the Umbria Jazz Winter Festival takes place annually in late December to early January in the city of Orvieto.
Pettino (Pitinum in Latin) is a "frazione" of the "comune" of Campello sul Clitunno and former Latin Catholic bishopric in the Province of Perugia, in central Italy's Umbria region.
Cesare Sermei (Città della Pieve, c.1581 – Assisi, 1668) was an Italian painter.
 Son of painter Fernando Sermei, he learned to paint in the workshop of Cesare Nebbia, primarily moving between Orvieto and Rome.
The Province of Perugia (Italian: "Provincia di Perugia" ) is the larger of the two provinces in the Umbria region of Italy, comprising two-thirds of both the area and population of the region.
 Its capital is the city of Perugia.
 The province covered all of Umbria until 1927, when the province of Terni was carved out of its southern third.
 The province of Perugia has an area of 6,334 km² covering two-thirds of Umbria, and a total population of about 660,000.
 There are 59 comunes (Italian: "comuni" ) in the province.
 The province has numerous tourist attractions, especially artistic and historical ones, and is home to the Lake Trasimeno, the largest lake of Central Italy.
 It historically the ancestral origin of the Umbri, while later it was a Roman province and then part of the Papal States until the late 19th century.
Perugia railway station, also known as Perugia Fontivegge railway station (Italian: "Stazione di Perugia; Stazione di Perugia Fontivegge" ) is the main station serving the city and "comune" of Perugia, in the region of Umbria, central Italy.
 Opened in 1866, it forms part of the Foligno–Terontola railway, which also links Florence with Rome.
Assisi (] , from the Latin: "Asisium" ) is a town and "comune" of Italy in the Province of Perugia in the Umbria region, on the western flank of Monte Subasio.