The last maker of the family was Nicolo 's son , Girolamo Amati , known as Hieronymus II . He was born on 26 February and died on 21 February , 1740 . The last maker of the family was Nicolo 's son , Girolamo Amati , known as Hieronymus II ( February 26 , 1649 â `` February 21 , 1740 ) .