Vratislaus I
Duke of Bohemia
Reign	915 – 13 February 921
Predecessor	Spytihněv I
Successor	Wenceslaus I
Born	c. 888
Died	13 February 921 (aged c. 33)
Burial	St. George's Basilica, Prague
Spouse	Drahomíra
Issue	Wenceslaus I, Duke of Bohemia Boleslaus I, Duke of Bohemia Střezislava (?)
Dynasty	Přemyslid
Father	Bořivoj I, Duke of Bohemia
Mother	Ludmila of Bohemia

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.

He was a son of Duke Bořivoj I of Bohemia by his wife Ludmila and the younger brother of Duke Spytihněv I. Around 906, he married Drahomíra, a Hevellian princess, to establish close ties with the Polabian Slavs. Vratislaus had at least two sons, Wenceslaus and Boleslaus, both of whom succeeded him as Bohemian dukes. Some historians believe that Střezislava, the wife of the Bohemian nobleman Slavník, founder of the Slavník dynasty, was also the daughter of Vratislaus.^[1]

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.

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v t e Monarchs of Bohemia
Přemyslid	Legendary Czech Krok Libuše Přemysl the Ploughman Valasca Nezamysl Mnata Vojen Vnislav Křesomysl Neklan Hostivít c. 870–1198 (Dukes) Bořivoj I Spytihněv I Vratislaus I Saint Wenceslaus Boleslaus I Boleslaus II Boleslaus III Vladivoj Boleslaus the Brave1 Jaromír Oldřich Bretislaus I Spytihněv II Vratislaus II (I)2 Conrad I Bretislaus II Bořivoj II Svatopluk the Lion Vladislaus I Sobeslaus I Vladislaus II (I)2 Frederick Sobeslaus II Frederick Conrad II Otto Wenceslaus II Ottokar I Henry Bretislaus Vladislaus III Henry 1198–1306 (Kings) Ottokar I Wenceslaus I Ottokar II Wenceslaus II Wenceslaus III
Non-dynastic	1306–1310 Henry the Carinthian Rudolph I
Luxembourg	1310–1437 John the Blind Charles IV (I) Wenceslaus IV Sigismund
Habsburg	1437–1457 Albert Interregnum Ladislaus the Posthumous
Non-dynastic	1457–1471 George Matthias I3
Jagiellonian	1471–1526 Vladislaus II Louis
Habsburg	1526–1780 Ferdinand I Maximilian Rudolph II Matthias II Ferdinand II Frederick4 Ferdinand III Leopold I Joseph I Charles II Charles Albert (II)3, 5 Maria Theresa
Habsburg-Lorraine	1780–1918 Joseph II Leopold II Francis II (I) Ferdinand V Francis Joseph Charles I (III)
1 Duke of Poland from the Piast dynasty 2 During his reign obtained non-hereditary royal title 3 Antiking 4 Elector Palatine from the Wittelsbach dynasty 5 Prince-elector of Bavaria from the Wittelsbach dynasty

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