Wittelsbach dynasty:
1831-1862: King Otto I
Schleswig-Holstein-Sonderburg-Glücksburg dynasty:
1863-1913: King George I
1913-1917: King Constantine I
1917-1920: King Alexander I
1920-1922: King Constentine I (restored)
1922-1924: King George II
1935-1947: King George II (restored)
1947-1964: King Paul I
1964-1974: King Constantine II