Also found in: Wikipedia.
Saxe-Altenburg(săks-ăl`tənbərg), Ger. Sachsen-Altenburg, former duchy, Thuringia, central Germany. Altenburg was the capital. Created a separate duchy in 1603, it was ruled by an Ernestine line of the house of WettinWettin
, German dynasty, which ruled in Saxony, Thuringia, Poland, Great Britain, Belgium, and Bulgaria. It takes its name from a castle on the Saale near Halle. The family gained prominence in the 10th cent.
..... Click the link for more information. . It passed (1672) to the dukes of Saxe-Gotha, but from 1826 to 1918 it was again a separate duchy under the collateral line of Saxe-Hildburghausen. In 1920 it was incorporated into Thuringia.