Carl Friedrich Gauss -- the king of mathematicains
Born: 30 April 1777 in Brunswick, Duchy of Brunswick (now Germany)
Died: 23 Feb   1855 in Göttingen, Hanover            (now Germany)
marriage：two times:
          1. Johanna Ostoff (9 October 1805 -- 11 October 1809)
              [She died after giving birth to their second son.]
                            two sons and one daughter        
          2. Minna (the best friend of Johanna.)
                             two sons and one daughter
Ph.D: Universität Helmstedt 1799  
Advisor: Johann Friedrich Pfaff