Giovanni Battista Grillo was an Italian painter born in 1550 in Genoa. He is known for his contributions to the Mannerist style, which is characterized by elongated forms and complex compositions. Grillo's work often featured religious themes and was influenced by the artistic trends of his time. Throughout his career, Grillo created numerous altarpieces and frescoes, showcasing his skill in capturing light and shadow. He was part of the vibrant artistic community in Genoa, which included other notable artists. Grillo's legacy continues to be appreciated for its unique blend of Renaissance and Mannerist elements.