John II, Count of Oldenburg (; died ) was Count of Oldenburg from 1275 until around 1301. He was the son of Christian III, Count of Oldenburg. His mother was either Hedwig von Oldenburg in Wildeshausenhttp://thepeerage.com/p780.htm#i7799 The Peerage or Jutta of Bentheim.
Marriages and issue John married twice. His first marriage was to Elisabeth, the daughter of John, Duke of Brunswick-Lüneburg and Liutgard von Holstein-Itzehoe. His second marriage was to Countess Hedwig of Diepholz.http://www.jmarcussen.dk/historie/reference/oldenburg.html Rulers of Oldenburg John had five children: Christian IV, Count of Oldenburg (de) John III, Count of Oldenburg (de), married Mechtild (Matilda) of Bronckhorst Conrad I, Count of Oldenburg Maurice of Oldenburg (de), (killed in action in 1368 near Blexen), Dean (Domdechant) of Bremen Cathedral, Diocesan Administrator of the Archdiocese of Bremen (1345–1362), Archbishop Elect of Bremen (1348, papally refused) and coadjutor of Bremen (1348–1360)Adolf Hofmeister, "Adel, Bauern und Stände", in: Geschichte des Landes zwischen Elbe und Weser: 3 vols., Hans-Eckhard Dannenberg and Heinz-Joachim Schulze (eds.), Stade: Landschaftsverband der ehem. Herzogtümer Bremen und Verden, 1995 and 2008, vol. I 'Vor- und Frühgeschichte' (1995; ), vol. II 'Mittelalter (einschl. Kunstgeschichte)' (1995; ), vol. III 'Neuzeit' (2008; ), (=Schriftenreihe des Landschaftsverbandes der ehem. Herzogtümer Bremen und Verden; vols. 7–9), vol. II: pp. 195-240, here p. 211. Gisela of Oldenburg; married Gerhard III, Count of Hoya (de)
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