About Giulia Grisi
Giulia Grisi was an Italian opera singer. She performed widely in Europe, the United States and South America and was among the leading sopranos of the 19th century. Rossini and Bellini both took an interest in her, she was the first to play the part of Adalgisa in Bellini's Norma in Milan, in which the dramatic soprano Giuditta Pasta took the title role. In 1838, her husband discovered a letter written to her by Frederick Stewart, 4th Marquess of Londonderry (then Lord Castlereagh), and the two men fought a duel on 16 June of that year.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.