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