Spanheimer

House of Sponheim
Country	Rhenish Franconia
Titles	Counts (Grafen, Reichsgrafen) of Sponheim Margraves of the Hungarian March and of Istria Dukes of Carinthia and Margraves of Verona
Founded	c. 1044
Founder	Siegfried I, Count of Sponheim
Final ruler	Joseph Carl, Reichsgraf von Ortenburg
Dissolution	1806
Cadet branches	Ortenburg-Neuortenburg, Bolanden-Dannenfels, Heinsberg, Neef, arguably Vianden

The House of Sponheim or Spanheim (also called Sponheimer or Spanheimer) was a medieval German noble family, which originated in Rhenish Franconia. They were immediate Counts of Sponheim until 1437 and Dukes of Carinthia from 1122 until 1269. A cadet branch ruled in the Imperial County of Ortenburg-Neuortenburg until 1806.

The family took its name from their ancestral seat at Sponheim Castle in the Hunsrück range, in present-day Burgsponheim near Bad Kreuznach, Rhineland-Palatinate. From the 11th century the family was divided in two closely related branches. One of these branches, probably the senior one, retained the Duchy of Carinthia and originated the County of Ortenburg in Bavarian. The other one remained in Rhenish Franconia, retaining the County of Sponheim.

The founder of the ducal branch was Count Siegfried I (1010–1065), a Ripuarian Frank by birth and retainer of the Salian emperor Conrad II. For this reason the family is sometimes termed the Siegfrieding. Siegfried followed Conrad in his 1035 campaign against Duke Adalbero of Carinthia, who for unknown reasons had fallen out of favour with the emperor. By his marriage to Richgard, daughter of one Count Engelbert of the Bavarian Sieghardinger noble family, he became heir to large territories in Carinthia and Tyrol. In 1045 Siegfried received the title of a margrave in the Hungarian March by Emperor Henry III. His sons Engelbert, Margrave in Istria from 1090, and Hartwig founded St. Paul's Abbey in the Lavanttal on their mother's estates in 1091.

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