By a redeployment of Hanoverian territories in 1731 the HanoverianDuchies of Bremen and Verden were conveyed the administration of the neighbouringLand of Hadeln. In 1807 the ephemericKingdom of Westphalia annexed the duchy, beforeFrance annexed it in 1810. In 1813 the duchy was restored to theElectorate of Hanover, which - after its upgrade to theKingdom of Hanover in 1814 - incorporated the duchy in areal union and the ducal territory, including Ihlienworth, became part of the newStade Region, established in 1823.