俄罗斯走的教皇国线吗？圣三一之国

三元王国吧

应该是斐迪南大公设想的三元帝国，在奥匈境内再搞一个斯拉夫人的王国，缓和矛盾

什么mod

应该是ramod吧，我之前也碰到过这个，甚至还能普鲁士→北德→大德→中欧→三一王国→意大利→中欧

旗帜甚至是克罗地亚的国旗

三一王国（Triune Kingdom）其实指的就是现在的克罗地亚，是克罗地亚民族复兴的想法，想把三个传统地方（克罗地亚、斯拉沃尼亚、达尔马提亚）统一成一个王国，当时克罗地亚和斯拉沃尼亚归属于匈牙利王国，而达尔马提亚直属于帝国议会。

根据楼上大佬信息，查到资料了——
Following on from the turbulence in Vienna of mid-March, 1848, political representatives drawn from across the historic Triune Kingdom of Croatia, Slavonia, and Dalmatia spontaneously convened on 25th March in Agram, the historic capital of Croatia, and issued a declaration setting out an agreed future course for the lands and peoples the saw themselves as representing:-"The nations of the Triune Kingdom, animated by the desire of continuing, as heretofore, under the Hungarian crown, with which the free crown of Croatia, Slavonia, and Dalmatia was voluntarily united by their ancestors; animated by the desire of remaining true to the reigning dynasty, ...animated by the desire of maintaining the integrity of the Austrian monarchy, and that of the kingdom of Hungary, ...making the following demands on the king's sense of justice:"
Some thirty "demands on the king's sense of justice" included:-
The first such demand was for the appointment of a Baron Jellachic as principal magistrate of the three united kingdoms as a man who commanded the confidence of the whole nation.
Subsequent demands displayed this Agram assembly's hopes for the full recognition of the Triune Kingdom, with its own ministers, and with the free use of the national language.
A demand was expressed for the formation of a National Guard which a later demand saw as "swearing fidelity to the common Constitution, their King, and the freedom of their nation, and of all other free nations composing the Austrian monarchy, according to the principles of humanity."
All public offices, without exception, temporal as well as spiritual, were to be held only by persons native to the Triune Kingdom.

左侧盾徽

真实的两个版本都有（1894年后正式改为克罗地亚在右），但正式版应该上面是匈牙利王冠