Adolphe Sax
Antoine-Joseph Sax was born on 6 November 1814, in Dinant, in what is now Belgium, to Charles-Joseph Sax and his wife. While his given name was Antoine-Joseph, he was referred to as Adolphe from childhood. His father and mother were instrument designers themselves, who made several changes to the design of the French horn. Adolphe began to make his own instruments at an early age, entering two of his flutes and a clarinet into a competition at the age of 15. He subsequently studied performance on those two instruments as well as voice at the Royal Conservatory of Brussels.
Ferdinand Bac
Ferdinand-Sigismond Bach was born in Stuttgart on 15 August 1859. 
His father, Karl Philipp Heinrich Bach (1811-1870), was a geologist, cartographer and landscape architect, the illegitimate son of Jérôme Bonaparte, King of Westphalia. 
Ferdinand was born of a second marriage of his father with Sabina Ludovica de Stetten, daughter of Baron Sigismund-Ferdinand Stetten.
The baron, born in 1772 in Bohemia, had attended the Congress of Vienna and told his memories to his grandson. 
Ferdinand Bac, a second cousin of Napoleon III, was raised on the margin of the court of the Second Empire.