1680 establishments in the Holy Roman Empire

Saxe-Meiningen ( ; ) was one of the Saxon duchies held by the Ernestine line of the House of Wettin, located in the southwest of the present-day German state of Thuringia.

Saxe-Gotha-Altenburg () was a duchy ruled by the Ernestine branch of the House of Wettin in today's Thuringia, Germany. The extinction of the line in 1825 led to a major re-organisation of the Thuringian states.

Saxe-Hildburghausen () was an Ernestine duchy and Imperial Estate of the Holy Roman Empire in the southern side of the present State of Thuringia in Germany. It existed from 1680 to 1826 but its name and borders are currently used by the District of Hildburghausen.

Saxe-Coburg () was a duchy held by the Ernestine branch of the Wettin dynasty in today's Bavaria, Germany.

Saxe-Römhild () was an Ernestine duchy in the southern foothills of the Thuringian Forest. It existed for only 30 years, from 1680 to 1710. thumb|Glücksburg Castle in Römhild

Saxe-Coburg-Eisenach was a duchy within the Holy Roman Empire. It existed during two fairly short periods: 1572-1596 and 1633–1638. Its territory was part of the modern states of Bavaria and Thuringia.

The Duchy of Saxe-Eisenberg was one of the Saxon Duchies held by the Ernestine line of the House of Wettin.

The Duchy of Saxe-Saalfeld was one of the Saxon Duchies held by the Ernestine line of the Wettin Dynasty. Established in 1680 for Johann Ernst, seventh son of Ernest I, Duke of Saxe-Gotha. It remained under this name until 1699, when Albert, Duke of Saxe-Coburg died without sons. His brother Johann Ernst of Saxe-Saalfeld became the new Duke of Coburg and the duchy was renamed into Saxe-Coburg-Saalfeld in 1735.