Oettingen-Wallerstein is a noble family related to a former County in modern-day eastern Baden-Württemberg and western Bavaria, Germany. The other formerly sovereign branch of the Oettingen family is the House of Oettingen-Spielberg.
House of Oettingen-Wallerstein Wikipedia
The Oettingen family was first mentioned in 1147 with Ludovicus comes de Otingen, a relative of the Imperial House of Hohenstaufen who was granted the county surrounding the Imperial city of Nördlingen as a fief.
Oettingen-Wallerstein was twice created; first as a partition of Oettingen (modern day town of Oettingen in Bayern) in 1423 which became extinct in 1486 and was inherited by Oettingen-Oettingen, and the second time as a partition of Oettingen-Oettingen in 1557. Oettingen-Oettingen suffered one partition, between itself and Oettingen-Spielberg in 1602. It was raised to a Principality in 1774, mediatised to the Kingdom of Bavaria in 1806, and divided with the Kingdom of Württemberg in 1810. At this time, the Principality had a territory of 850 km² with 60.000 inhabitants.