Ivrea (ēvrĕ´ä), city (1991 pop. 24,704), Piedmont, NW Italy, on the Dora Baltea River. It is a commercial and industrial center, and it is the headquarters of Olivetti, an important Italian company. Manufactures include typewriters, computers, and textiles. A Roman town (Eporedia), it was later the capital of a Lombard duchy and then the seat of a marquisate. Berengar II, one of its rulers, was briefly king of Italy (mid-10th cent.). Ivrea passed to the house of Savoy in the 14th cent. The city is dominated by a picturesque castle (14th cent.), which has four red brick towers.
"Ivrea." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (April 24, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ivrea
"Ivrea." The Columbia Encyclopedia, 6th ed.. . Retrieved April 24, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ivrea