Namesakes for Konstantin

Namesakes for KONSTANTIN:
  Bulgarian Kings and Tsars: 2 tsars
      Tsar Konstantin I   1257-1277  
      Tsar Konstantin II   1397-1422  

  Nobel Prize Winners: 1 physics
      (physics) Konstantin Novoselov   2010  

  Russian Grand Dukes and Tsars: 1 duke
      Duke Konstantin   1216-1218