Prince Frederick William of Schleswig-Holstein-Sonderburg-Augustenborg was a member of the House of Oldenburg and a Prince of Schleswig-Holstein-Sonderburg-Augustenburg.
Background
He was the youngest son of Duke Ernest Günther, Duke of Schleswig-Holstein-Sonderburg-Augustenburg and his wife, Auguste of Schleswig-Holstein-Sonderburg-Glücksburg. In 1675, when his father negotiated with Count Peder Griffenfeld about a marriage with Frederick William"s sister, he was promised a profitable post as provost of the Cathedral in Hamburg and governor of Als.
Career
He was appointed as provost in Hamburg in 1676, after chairman Kielmansegge died. When his father died in 1689, the will stated that his possessions would go to his widow, who would have the right to settle the succession. She made a decision, which was upheld by the King in 1692.
Almost simultaneously, Frederick William was also appointed governor of Sønderborg.
Ernest Augustus was also reinstated as heir of Schleswig-Holstein-Sonderburg-Augustenburg. Nevertheless, when Ernest Augustus died childless in 1731, Frederick William"s son Christian August would inherit the duchy.
When his mother died in 1701, Frederick William inherited Augustenborg Palace, Rumohrsgaard Manor and Evelgunde Manor. In 1703, he purchased Avnbølgaard Manor in Sundeved.
Frederick William served as a Major General in the Danish army.
She died on 24 December 1741.