Agnes of Leiningen

Agnes of Leiningen (; died after December 1299) was a Countess of Nassau by marriage to Otto I, Count of Nassau. She was probably Regent of the County of Nassau for some time for her youngest son after the death of her spouse in 1289/1290. Biography Agnes was a daughter of Count Emich IV of Leiningen and his wife Elisabeth. She married before 1270 Count Otto I of Nassau (died between 3 May 1289 and 19 March 1290). Her husband had divided the County of Nassau with his elder brother Walram II on 16 December 1255, on which occasion Otto had obtained the area north of the river Lahn, containing, among others, Siegen, Dillenburg, Herborn, Tringenstein, Neukirch and Emmerichenhain. "" ("Otto Count of Nassau... with our wife Agnes and Henry our firstborn son") confirmed the gift of goods "" to the church in "Aldenburg" (sic, for Altenberg Abbey) made by "" ("our mother the Countess Matilda of blessed memory... and our sister Catherine located in the same place") by charter dated 3 May 1289. This is the last mention of Otto: in a charter dated 19 March 1290 he is mentioned as deceased.