Career
The Duchy of Württemberg-Neuenstadt was a branch line of the ducal House of Württemberg in the 17th and 18th century named after the town of residence, Neuenstadt. Under the arrangement Frederick Achilles, then 26, was bequeathed Neuenstadt Castle and an annual endowment of 10,000 guilder. Frederick Achilles never married so after his death in 1631 the castle returned to the main line of the duchy before the Duchy of Württemberg-Neuenstadt was reinstated in 1649 under Duke Frederick.