Charles II Otto (German: Karl II Otto) (5 September 1625 – 30 March 1671) was the Duke of Zweibrücken-Birkenfeld from 1669 until 1671.

Life Charles Otto was born in Birkenfeld in 1625, into the House of Wittelsbach, as an only son of George William, Count Palatine of Zweibrücken-Birkenfeld by his first wife, Countess Dorothea of Solms-Sonnenwalde (1586–1625). He succeeded his father in 1669.

Marriage Charles Otto married his cousin, Countess Margaret Hedwig of Hohenlohe-Neuenstein (1 January 1625 – 24 December 1676), the daughter of Count Kraft VII, Count of Hohenlohe-Neuenstein, on 30 November 1616 and had the following children: Charles William (22 August 1659 – 18 April 1660) Charlotte Sophie (14 April 1662 – 14 August 1708) Hedwig Eleanore (17 August 1663 – 12 April 1721)

Death Charles Otto died 30 March 1671 in Birkenfeld and was buried in Meisenheim.http://www.royaltyguide.nl/families/fam-U-V-W/wittelsbach/pfalz-05.htm

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