Kingdom of Bohemia (Premyslid Bohemia)

Kingdom of Bohemia existed 3 times as seccesion of Duchy of Bohemia from 1085 to 1092, from 1158 to 1172 and from 1198 to 1306 (1918 in our timeline). [Flag and Coat here]

Untrue Kingdom
Title of king was given to dukes of Bohemia form Holy Roman Emperors two times, in 1085 to Vratislaus II and in 1152 to Vladislaus II with both titles only for them. For title kept in the family Bohemians had to wait for Ottokar I.

Third Kingdom and Empire of Greater Bohemia and Poland
From Ottokar I to Wenceslaus III the kingdom was once given to another ruler line, once battled against Holy Roman Empire and mine half the silver in Europe. But it finally became part of bigger Empire in 1306. Called Empire of Great Bohemia and Poland was geographicly divided into Poland and Bohemia and Kingdom of Bohemia staid part of Empire for another two centuries, yet world Great was given infront of the name, it was smaller then Poland. In 1587 when last Premyslid died out the name Bohemia dissapered out of maps.

Geography
From 1306 to 1436 it looked much like modern Czech Republic without its Silesia part. As today Czech Republic, its biggest rivers are Elbe, Vltava and Moravia. While Bohemia is highland if we don't take into accaunt Elbe where near today Děčín it is only 200 meters above ocean. Moravia is lowland only. Its highest waterfall is Pančava waterfall. It main mountain are Bohemia Forest and Krkonoše where is highest mountain Snežka. From 1436 to 1587 it included Lower Silesia and Opole with small part of Silesia.