The Papacy is omitted because, let's face it, most of those who wish there were still a King of France and a Holy Roman Emperor probably also wish the Holy See had a different occupant at present, and it's impossible to imagine the current one ruling the old Papal States. Smaller states are omitted as there would presumably be a lot more than just Luxembourg, Liechtenstein, and Monaco.
The "Imperial Commonwealth" is a new entity distinct from the Holy Roman Empire (whose own modern borders would be roughly those of Germany, Austria, and the Czech lands, with Belgium, Luxembourg, and Slovenia eligible to join if desired), modeled on the [British] Commonwealth of Nations, and meant to include the present states of Austria (including South Tyrol), the Czech lands, Slovakia, Hungary, Slovenia (including Trieste), Croatia, possibly Bosnia, and perhaps also the old Kingdom of Galicia & Lodomeria if detached from what is now Poland & Ukraine, retaining their separate parliaments and prime ministers but sharing the Habsburg Emperor as head of state. The ancient titles of King of Bohemia and King of Hungary would be retained, with the Emperor being also King of Austria, King of Slovakia, Grand Duke of Slovenia, and King of Croatia, an admittedly unprecedented arrangement designed to reflect modern realities as much as possible.
Admittedly there was never a time when all of these monarchies existed at once, but I think this is more or less the way most monarchists would like things to be. In this scenario, as a demonstration of the spirit of moderation and reasonableness that distinguishes monarchists from republicans, the republics of Iceland, Ireland, Finland, Estonia, Latvia, Lithuania, Switzerland, and San Marino are permitted to survive, and those of Venice and Genoa would actually be restored! I'm honestly not sure what to do with Belarus and Ukraine, on whose territory Russia, Poland, and the Habsburgs would all have reasonable historic claims. Perhaps Poland could be shifted back east at their expense and to Prussia's benefit, but I'm not sure we really want to go there. "Kaliningrad" would be renamed Königsberg and returned to the Kingdom of Prussia, as an exclave if necessary. Kosovo and perhaps also Macedonia would be returned to the Kingdom of Serbia. Moldova would be returned to the Kingdom of Romania, as compensation for losing Transylvania to the Kingdom of Hungary.
| Country | Sovereign | Born | Acceded | |||
| Bulgaria | King Simeon II | 16 Jun | 1937 | 28 Aug | 1943 | |
| United Kingdom | Queen Elizabeth II | 21 Apr | 1926 | 6 Feb | 1952 | |
| Two Sicilies | King Carlo I | 16 Jan | 1938 | 3 Feb | 1964 | |
| Greece | King Constantine II | 6 Jun | 1940 | 6 Mar | 1964 | |
| Serbia | King Alexander II | 17 Jul | 1945 | 3 Nov | 1970 | |
| Denmark | Queen Margrethe II | 16 Apr | 1940 | 14 Jan | 1972 | |
| Sweden | King Carl XVI Gustaf | 30 Apr | 1946 | 19 Sep | 1973 | |
| Württemberg | King Carl II | 1 Aug | 1936 | 15 Apr | 1975 | |
| Portugal | King Duarte III | 14 May | 1945 | 24 Dec | 1976 | |
| Sardinia | King Amedeo X | 27 Sep | 1943 | 18 Mar | 1983 | |
| Montenegro | King Nikola II | 7 Jul | 1944 | 24 Mar | 1986 | |
| Hannover | King Ernst August V | 26 Feb | 1954 | 9 Dec | 1987 | |
| France | King Louis XX | 25 Apr | 1974 | 30 Jan | 1989 | |
| Norway | King Harald V | 21 Feb | 1937 | 17 Jan | 1991 | |
| Russia | Empress Maria I | 23 Dec | 1953 | 21 Apr | 1992 | |
| Prussia | King Georg Friedrich I | 10 Jun | 1976 | 25 Sep | 1994 | |
| Bavaria | King Franz I | 14 Jul | 1933 | 8 Jul | 1996 | |
| Holy Roman Empire Bohemia & Hungary Imperial Commonwealth |
Emperor Karl IX | 11 Jan | 1961 | 4 Jul | 2011 | |
| Albania | King Leka II | 26 Mar | 1982 | 30 Nov | 2011 | |
| Poland | King Alexander II | 12 Feb | 1954 | 23 Jul | 2012 | |
| Saxony | King Rüdiger I | 23 Dec | 1953 | 6 Oct | 2012 | |
| Netherlands | King Willem IV | 27 April | 1967 | 30 April | 2013 | |
| Belgium | King Philippe I | 15 Apr | 1960 | 21 Jul | 2013 | |
| Spain | King Felipe VI | 30 Jan | 1968 | 19 Jun | 2014 | |
| Romania | Queen Margareta | 26 Mar | 1949 | 5 Dec | 2017 | |
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