Henry I, Count of Nassau-Beilstein (1307–1388) was a son of Henry I of Nassau-Siegen and his wife, Adelaide of Heinsberg-Blankenberg. His parents had initially destined him for an ecclesiastical career. However, he later married Meyna (Imagina) of Westerburg and after his father's death became the first count of Nassau-Beilstein.
Henry and Meyna had three children: Henry II, his successor Reinhard (d. 1412) Adelaide, married Hartmuth of Cronberg.
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