More information for my planned 'Wider Still, And Wider' (or 'Earth-Fred') TL_
Royal Houses of Europe (1913)
Kingdom of Great Britain (includes Gibraltar and also [effectively, & probably soon legally as well] Dunkirk; with its ‘Crown Dependencies’, namely_ Lordship of Mann, Duchy of Normandy [administered as two separate ‘Balliwicks’: Jersey and Guernsey], Lordship of Heligoland); Kingdom of Ireland; Britannic Empire (also relevant for Malta, ‘Minorca & Majorca’, the ‘Ionian Islands’) = House of Osborne*
Empire of Austria = House of Habsburg
Kingdom of Hungary-Croatia = House of Habsburg-Hungary
Kingdom of the Lands of St Wenceslaus = House of Habsburg [“Third branch”]
[The Emperor of Austria is primus inter pares for this trio]
Kingdom of the United Netherlands (including the Grand Duchy of Luxemburg) = House of Orange-Nassau
Kingdom of Denmark-Norway = House of Holstein-Sonderburg-Glucksburg
Principality of Estonia = House of Holstein-Sonderburg-Glucksburg [cadet branch]
Kingdom of Sweden, with Finland = House of Holstein-Augustenburg
Kingdom of Italy = House of Savoy [old ‘main’ branch surviving, not replaced by ‘Savoy-Carignan’ branch as IOTL]
Kingdom of Portugal = House of Braganza
Kingdom of Spain = House of Bourbon-Berwick [civil war in progress vs. republicans]
Kingdom of Greece = Saxe-Coburg [a branch of the House of Wettin]
Kingdom of Jugoslavia = House of Battenberg [with a similar but not identical origin to the OTL family of that name]
Principality of Monaco = House of Grimaldi
Principality of Montenegro = House of Petrovich-Njegosh
Prussia (which is either a Kingdom or [only] a Grand Duchy now, a point about which the diplomats are still negotiating, but in either case has been reduced so far that it consists solely of East Prussia) = Hohenzollern [of the Brandenburg-Prussia branch]
The German League = (the position of ‘Bund-Protector’ is elective, and is currently held by “Augusta II, Prince-Elector of Hanover” [i.e. Queen Augusta II of Great Britain]; most of the states within the League have specific Princes of their own, too)
Regency of Poland = (under discussion _ probably the leading candidate for king, if Britain can be persuaded not to oppose him, is John James Poniatowski-Stuart, the Prince of Fulda, who is descended not only from the country’s last pre-partition king but also from the famous King John Sobieski who led his army to break the Turks’ second siege of Vienna: It’s the fact that that the latter lineage is traced through “Bonnie Prince Charlie” [whose mother was a grand-daughter of King John, and who married at a rather earlier date ITTL than IOTL, and to a Polish noblewoman — from the court of Duke Stanislas of Lorraine — rather than a German one as IOTL] that has the British government slightly concerned)
France (government under rearrangement): monarchist factions = Bourbon-Orleans [‘Egalitéists’], Bourbon-Orleans [‘Legitimists’, or ‘Bourbon-Orleans-Orleans’], Bourbon-Orleans-Berry [‘Vrai-ists’]; imperialist faction = Pichegru
Russia (multi-factional civil war in progress) = ‘Romanov’ [actually Holstein-Gottorp]
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* This dynastic name was proclaimed by Queen Augusta II when she succeeded to the throne in 1908, with the prior approval of her great-aunt & predecessor Queen Augusta I. She made this decision to simplify matters, because although Her Majesty is of Hanoverian ‘Guelph’ lineage through her maternal grandmother (who was Queen Augusta I’s younger sister), her ancestry through [recent] male lines is from the Houses of Holstein-Sonderburg-Glucksburg (via a prince of Denmark) and of Battenberg instead. However her children will still use ‘Guelph’ as their personal surname, not only because of that Hanoverian connection but also because her consort Prince William is himself a Guelph… He is a member of the dynasty’s ‘Brunswick-Heidelberg’ branch [established 1813, by the Congress of Vienna], younger brother to Prince-Elector Frederick of the Rhenish Palatinate.