Andrea Amati’s two sons were Antonio Amati who was born about 1540 in Cremona and died there on 14 February 1607 and Girolamo Amati who was born about 1561 in Cremona and died of the plague there on 21 October 1630. They are known as "The Brothers Amati", but they did not work much together. However, they both produced some great instruments. They made the shape of the f holes perfect and gave their instruments more strength. They also made some large violas and cellos. They had an enormous influence on all other violin makers.