Wikipedia
Fürstenberg-Fürstenberg is the collective term applied to those territories ruled by the imperial princes of Fürstenberg in the Circle of Swabia during the latter centuries of the Holy Roman Empire. The principality existed as an imperially immediate territory from when Hermann Egon was elevated to the estate of imperial princes (Reichsfürstenstand) in 1664 until its mediatisation in 1806.
The principality consisted at times of two historical states in southern Baden-Württemberg, Germany. Both counties were named after the state of Fürstenberg and the castle of the same name. The first county was created as a partition of the County of Fürstenberg in 1408. After the death of its only Count, Henry VIII, it was partitioned between Fürstenberg-Baar and Fürstenberg-Geisingen. The second state emerged as a partition of Fürstenberg-Stühlingen in 1704. It was raised to a Principality in 1716, and was partitioned between itself and Fürstenberg-Pürglitz in 1762 after the death of Prince Joseph William Ernest. When Prince Charles Joachim, the last of the Fürstenberg-Fürstenbergian Princes, died in 1804, the County was inherited by the Princes of Fürstenberg-Pürglitz.