The Barovier family leads the oldest glass production in the world; traces of their activity in artistic glass production date back to the 13th century. A very important representative of this family was Angelo Barovier (1405-1460), an artistic master of the Italian Renaissance, whose role in the history of Murano glass can be compared to Leonardo's and Michelangelo's contribution to painting and sculpture. It was Angelo who discovered the so-called "Venetian crystal". One of his nephews, Anzoletto, was also very famous in the 16th century, in the period when the Baroviers expanded the number of factories to three. During the 17th century, the Toso family began its artistic production of Murano glass and some of its members soon became known as skilled glass artists.