Parmigianino

Girolamo Francesco Maria Mazzola January 1503160August 1540 was an Italian Mannerist painter and printmaker active in Florence, Rome, Bologna, and his native city of Parma. His work is characterized by a refined sensuality and often elongation of forms and includes Vision of Saint Jerome and the iconic if somewhat untypical Madonna with the Long Neck , and he remains the best known artist of the first generation whose whole careers fall into the Mannerist period.

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Source: Wikipedia