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Usingen lies on the Usa River in the Usinger Becken at the north-eastern edge of the Taunus. It is located about 30 km north of Frankfurt am Main, 27 km south of Wetzlar and 38 km northeast of Wiesbaden, putting it on the edge of the Frankfurt Rhein-Main Region . The town core is about 300 m above sea level.

Nassau-Usingen was a county of the Holy Roman Empire in the Upper Rhenish Circle that became a principality in 1688. The origin of the county lies in the medieval county of Weilnau that was acquired by the counts of Nassau-Weilburg in 1602.

cawiki Carolina de Nassau-Usingen; cswiki Karolina Nasavsko-Usingenská; dawiki Karoline Polyxene af Nassau-Usingen; dewiki Karoline Polyxena von Nassau-Usingen; elwiki Καρολίνα του Νάσσαου-Ούζινγκεν; enwiki Princess Caroline of Nassau-Usingen; eswiki Carolina de Nassau-Usingen; frwiki Caroline de Nassau-Usingen

Carolina di Nassau-Usingen Sposò, il 2 dicembre 1786 a Biebrich, il Langravio Federico d'Assia-Kassel (1747–1837), figlio minore di Federico II, Langravio d'Assia-Kassel e della principessa Maria di Gran Bretagna, figlia di Giorgio II di Gran Bretagna.Richard Glanville-Brown, online, Richard Glanville-Brown (RR 2, Milton, Ontario, Canada), downloaded 17 August 2005.

Enrichetta di Nassau-Weilburg Francesco di Teck Claudine Rhédey von Kis-Rhéde: László Rhédey von Kis-Rhéde Ágnes Inczédy von Nagy-Várad Maria di Teck Adolfo, duca di Cambridge: Giorgio III del Regno Unito Carlotta di Meclemburgo-Strelitz Maria Adelaide di Cambridge Augusta d'Assia-Kassell: Federico d'Assia-Kassel Carolina di Nassau-Usingen