| County of Sponheim-Sayn Grafschaft Sponheim-Sayn |
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| State of the Holy Roman Empire | ||||
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| Capital | Not specified | |||
| Government | Principality | |||
| Historical era | Middle Ages | |||
| - Partitioned from Sponheim-Eberstein |
1261 | |||
| - Partitioned in twain | 1283 | |||
Sponheim-Sayn was a County of Rhineland-Palatinate and North Rhine-Westphalia, Germany. It was created as a partition of Sponheim-Eberstein in 1261, and it comprised the lands of the former County of Sayn. In 1283, it was divided into Sayn and Sayn-Homburg.