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Vratislaus (or Wratislaus) I (Czech: Vratislav I.; c. 888 – 13 February 921), a member of the Přemyslid dynasty, was Duke of Bohemia from 915 until his death in 921.
Upon the death of his elder brother Spytihněv in 915, Vratislaus became duke at a time when the Bohemian lands around Prague Castle had already distanced themselves from the political and cultural sphere of Great Moravia and fallen under the influence of East Francia, especially during the rule of Duke Arnulf of Bavaria. The contemporary Annales Fuldenses report that the Bavarian forces had attacked Prince Mojmír II of Moravia in alliance with the Bohemians already in the year 900. On the other hand, Duke Vratislaus offered the Hungarian invaders free passage and supported their campaign against the Saxon duke Henry the Fowler in the year 915.
Vratislaus is credited with the establishment of St. George's Basilica at Prague Castle and also with the foundation of the Silesian city of Wrocław (Breslau), whose Latin name "Vratislavia" denotes his initiative. He died in battle against the Hungarians, possibly in 919, although 921 is more often conjectured.
^Loserth, Johann (2008). "Propast hrvatske kneževske obitelji Slavnikovića" [The collapse of Croatian princely family Slavniković]. In Nosić, Milan (ed.). Bijeli Hrvati II [White Croats II] (in Croatian). Maveda. pp. 168–169. ISBN978-953-7029-12-8.
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