The Ionian Islands have notes newer than the 1864 handover to Greece. I think rulers can be applyed.
I have made this list, based on the list of Greek rulers, but George II may be unnecceray.
I suggest we add:
Kingdom of Greece
House of Schleswig-Holstein-Sonderburg-Glücksburg
- George I (1864-1913)
- Constantine I (1913-1917, 1920-1922)
- Alexander (1917-1920)
- George II (1922-1924, 1935-1947)
Italian Occupation (1941-1944)