Both the earliest Polish and Hungarian states (by the 10-11th centuries) were strongly tied to the HRE after the conversion to Christianism of their corresponding leaders, but they never were formally subdued to the Imperial authority and both countries remained outside the HRE sphere even if, in the case of Hungary, were later united to the Habsburgian crown.
Why if the Ottonians would have opted for making them two formal duchies of the HRE, instead of satellital/vassal/peripheral entities?
* Possible consequences:
- Christianization (and colonization) of Prussia, the Baltic and Lithuania could have been faster and easier; given that the HRE could have remained more centralized for more time, like in the Ottonian/Salian era, until these events, maybe the HRE could have spanned from the Meuse to Ingria and Belarus. Probably no need of Teutonic Knights, northern Crusades and so.
- Major involvement of the German states against the advance of the Ottomans in the western Balkans. Maybe the Ottoman occupation of Hungary could have been avoided, probably also in Bosnia.
- The HRE becomes a more multi-cultural entity, unless policies of Germanization would be implemented in Poland and Hungary at earlier times (reducing Poles and Magiars to a status analogue to the Sorbs today).
- Reformation might have a more limited impact: there would be more pro-Catholic lands inside the HRE, maybe no free Prussia also. If so, the Thirty Years War could be avoided.
Why if the Ottonians would have opted for making them two formal duchies of the HRE, instead of satellital/vassal/peripheral entities?
* Possible consequences:
- Christianization (and colonization) of Prussia, the Baltic and Lithuania could have been faster and easier; given that the HRE could have remained more centralized for more time, like in the Ottonian/Salian era, until these events, maybe the HRE could have spanned from the Meuse to Ingria and Belarus. Probably no need of Teutonic Knights, northern Crusades and so.
- Major involvement of the German states against the advance of the Ottomans in the western Balkans. Maybe the Ottoman occupation of Hungary could have been avoided, probably also in Bosnia.
- The HRE becomes a more multi-cultural entity, unless policies of Germanization would be implemented in Poland and Hungary at earlier times (reducing Poles and Magiars to a status analogue to the Sorbs today).
- Reformation might have a more limited impact: there would be more pro-Catholic lands inside the HRE, maybe no free Prussia also. If so, the Thirty Years War could be avoided.