Otakar IV, tomb panel in St. Heinrich am Bachern, Slovenia
Otakar IV, b. 1163, d. May 8, 1192, Margrave and from 1180 Duke of Styria, son of Otakar III, last of the Otakare dynasty. Concluded the Georgenberg testamentary contract of 1186 with the Babenberg Duke Leopold V (Georgenberger Handfeste), which led to the union of Austria and Styria in 1192 (after his death) and to the expansion of the territory of what was to become Austria. O. died without issue.
Literature: F. Krones, Die Markgrafen von Stmk., in: Archiv für ö. Geschichte 84, 1898; F. Posch, Die Entwicklung der Stmk. bis zum Erbanfall an die Babenberger, in: 1000 Jahre Babenberger, exhibition catalogue, Lilienfeld 1976; G. Pferschy (ed.), Das Werden der Stmk. Die Zeit der Traungauer, publication of the Styrian provincial archives 10, 1980.