King Otakar XXI.

'''[https://www.youtube.com/channel/UCsP06G07Z9aNZr1mDUpbJ0Q King Otakar XXI. Of Bohemian Premyslid Empire]''', also known on the wiki as "OtakarPremyslid" is mapping-like videos maker.

His main series is: Alternate future of Bohemia and Alternate future of Europe in Country Balls. Is Youtube account started on 10th of October 2015.

He was mainly inspirated by BR Mapping, Ion Mapping, NTR Mapping and Nick HD Mapping.

His first video was "Alternate History of Bohemia - 1. Episode "The Beginnings" (700AC-800AC)" and it was the first video of his first Alternate history series; Alternate History of Bohemia. He is still making this on his youtube channel.

His official nation is Bohemian Premyslid Empire, country ball of this nation is even in his profile picture. The nation itself has a page on the wiki.

His secondary official nation is Kingdom of Bohemia, the nation also has page on the wiki.