Reuss Senior Line (shaded pink) within the Germanian region of Thurngia.

The Principality of Reuss Senior Line is an principality in the Holy Germanian Empire, ruled by the House of Reuss. The Counts Reuss of Greiz, Lower- and Upper Greiz (Germanian: Reuß zu Greiz, Untergreiz und Obergreiz), were elevated to princely status in 1778.

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