Nicolò Beregan
Count Nicolò Beregan (also Berengani and Bergani; 21 February 1627 – 17 December 1713) was a nobleman, lawyer and amateur opera librettist from the Republic of Venice. His Giustino was first set to music in 1683 by composer Giovanni Legrenzi for Il Giustino, and later reused by both Vivaldi (Giustino, 1724) and Handel (Giustino, 1737).