Adolph I, Count of Nassau-Wiesbaden-Idstein (1307 – 17 January 1370) was a son of Count Gerlach I and Agnes of Hesse.

In 1344, his father abdicated in favor of his sons.

They ruled jointly until 1355, then divided their inheritance: In 1322 Adolph married Margaret of Nuremberg, the daughter of Frederick IV, Burgrave of Nuremberg.

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