Amt Spiegelberg

Amt Spiegelberg consists of what had been the sovereign County of Spiegelberg prior to 1494 when its count inherited Pyrmont. Between 1494 and 1558, the Amt served as the Spiegelberg contribution to the County of Spiegelberg-Pyrmont. In 1558, sovereignty shifted to Brunswick-Calenberg, but administrative responsibilities were assumed by the County of Lippe-Spiegelberg-Pyrmont until 1583. From there, they passed to the County of Gleichen-Tonna until 1631, and then to the County of Nassau-Dietz (and its successors). After the Holy Roman Empire ended in 1806, it was absorbed into the Kingdom of Westphalia (a Napoleonic client state).