Heinrich XXIV, Prince Reuss of Greiz
Heinrich XXIV, Prince Reuss of Greiz was the last reigning Prince Reuss of Greiz from 1902 to 1918. Then he became Head of the House Reuss of Greiz which became extinct at his death in 1927.
Heinrich XXIV was born at Greiz, Principality of ReussGreiz, only son of Heinrich XXII, Prince Reuss of Greiz , and his wife, Princess Ida of SchaumburgLippe , .
Source: Wikipedia