This is a pretty simple question.
The lands owned and ruled by the Teutonic Knights within Germany were certainly part of the Holy Roman Empire.
Were the lands of the Teutonic Knights in the Baltic region, such as Prussia, Estonia, and Latvia, part of the Holy Roman Empire?
Some sources indicate that they were, and some that they weren't. Some atlases of medieval history show that the border of the Holy Roman Empire included the Baltic lands of the Teutonic Knights and some that it didn't.
So does anyone have a definite answer?