Domenico Gaetano Maria Donizetti (November 1797 – April 1848) was an Italian opera composer from Bergamo, Lombardy. Donizetti's most famous work is Lucia di Lammermoor (1835). Along with Vincenzo Bellini and Gioacchino Rossini, he was a leading composer of bel canto opera.
The youngest of three sons, Donizetti was born in 1797 in Bergamo's Borgo Canale quarter located just outside the city walls. His family was very poor with no tradition of music, his father being the caretaker of the town pawnshop. Nevertheless, Donizetti received some musical instruction from Johann Simon Mayr, a priest at Bergamo's principal church (and also himself a composer of successful operas).
Donizetti was not especially successful as as a choirboy, but in 1806 he was one of the first pupils to be enrolled at the Lezioni Caritatevoli school, founded by Johann Simon Mayr, in Bergamo through a full scholarship. He received detailed training in the arts of fugue and counterpoint, and it was here that he launched his operatic career. After some minor compositions under the commission of Paolo Zanca, Donizetti wrote his fourth opera, Zoraïda di Granata. This work impressed Domenico Barbaia, a prominent theatre manager, and Donizetti was offered a contract to compose in Naples. Writing in Rome and Milan in addition to Naples, Donizetti achieved some success (his 31 operas written in the space of just 12 years were usually popular successes, but the critics were often unimpressed), but was not well known internationally until 1830, when his Anna Bolena was premiered in Milan. He almost instantly became famous throughout Europe. L'elisir d'amore, a comedy produced in 1832, came soon after, and is deemed one of the masterpieces of the comic opera, as is his Don Pasquale, written in 1843. Shortly after L'elisir d'amore, Donizetti composed Lucia di Lammermoor, based on the Sir Walter Scott novel The Bride of Lammermoor. It became his most famous opera, and one of the high points of the bel canto tradition, reaching stature similar to Bellini's Norma.
Additional info here.