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Around 874 AD the Vistulans are subjugated by the Great Moravian King Svatopluk I who incorporates their territory to the First West Slavic Kingdom in the region. (Present day border of Czech Republic & Slovakia).

https://commons.wikimedia.org/wiki/Category:Svatopluk_I#/media/File:Ka%C5%A1na_se_sochou_Svatopluka_(Lo%C5%A1tice).JPGhttps://commons.wikimedia.org/wiki/File:Great_Moravia_during_Svatopluk_(cs).svghttps://en.wikipedia.org/wiki/Svatopluk_I_of_Moravia#/media/File:Bratislava_Profesionalita_maestra_Kulicha.jpg

The coming of the Magyars in 900 AD ended the existence of the short-lived kingdom, making way for the Bohemian Duke Boleslaus I in (955 AD) who was assigned with the control of the area by Otto I, Holy Roman Emperor, after their common victory over the invading nomads.

https://en.wikipedia.org/wiki/Otto_I,_Holy_Roman_Emperor#/media/File:Central_Europe,_919-1125.jpghttps://en.wikipedia.org/wiki/Boleslaus_I,_Duke_of_Bohemia#/media/File:%C4%8Cesk%C3%BD_st%C3%A1t_v_X._stolet%C3%AD_za_Boleslava_I._a_II.jpg