Gerlach I of Nassau-Wiesbaden
Gerlach I of Nassau (1271 – 7 January 1361), Count of Nassau in Wiesbaden, Idstein, Weilburg, and Weilnau.

He was a son of Emperor Adolf of Nassau-Weilburg and Imagina of Isenburg-Limburg.

He was married two times. First, 1307 with Agnes, a daughter of Agnes of Bavaria, Margravine of Brandenburg-Stendal and her first husband Henry the Younger of Hesse, and hence a granddaughter of Landgrave Henry I "the Child" of Hesse and had the following children:

Adolph I, Count of Nassau-Wiesbaden-Idstein (1307 – 17 January 1370, Idstein).

John I of Nassau-Weilburg (1309 – 20 September 1371, Weilburg).

Gerlach (1322 – 12 February 1371, Aschaffenburg), Archbishop of Mainz.

Adelheid (d. 8 August 1344), married 1329 to Ulrich III, Lord of Hanau.

Agnes, a nun at Klarenthal Abbey.

Elisabeth (ca. 1326–ca. 1370), married before 16 August 1326 to Louis of Hohenlohe.

Marie (d. 1366), married before 1336 to Konrad of Weinsberg.Second, he married before 4 January 1337 Irmgard of Hohenlohe-Weikersheim, daughter of Kraft II of Hohenlohe-Weikersheim and had the following children:

Kraft of Nassau-Sonnenberg (d. 1356), fell in the Battle of Poitiers.

Rupert, Count of Nassau-Sonnenberg (d. 4 September 1390).