Tags: Noble.
Frederick William Adolf (20 February 1680 – 13 February 1722) was the titular Prince of Nassau-Siegen from 1691 until his death; he actually ruled the principality from 1707. He constructed the Lower Castle in Siegen.He was the eldest son of Prince William Maurice of Nassau-Siegen and his wife Ernestina Charlotte of Nassau-Dillenburg. He was only 11 years old when his father died. His uncle John Francis Desideratus took up the regency.