States and territories disestablished in 1826

former kingdom that was centred in the Brahmaputra Valley in Assam, India

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-Coburg-Saalfeld () was one of the Saxon Duchies held by the Ernestine line of the House of Wettin. Established in 1699, the Saxe-Coburg-Saalfield line lasted until the reshuffle of the Ernestine territories that occurred following the extinction of the Saxe-Gotha line in 1825, in which the Saxe-Coburg-Saalfeld line received Gotha, but lost Saalfeld to Saxe-Meiningen.

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.

small independent Italian state (1440–1826)

county in Sweden between 1819 and 1826