Middle High German is the term for the form of German spoken in the High Middle Ages. It is conventionally dated between 1050 and 1350, developing from Old High German and into Early New High German.
The High German languages or High German dialects (German: hochdeutsche Mundarten) comprise the varieties of German spoken south of the Benrath and Uerdingen isoglosses in central and southern Germany, Austria, Liechtenstein, Switzerland, Luxembourg, and eastern Belgium, as well as in neighbouring portions of France (Alsace and northern Lorraine), Italy (South Tyrol), the Czech Republic (Bohemia), and Poland (Upper Silesia). They are also spoken in diaspora in Romania, Russia, the United States, Brazil, Argentina, Mexico, Chile, and Namibia.
Old High German evolved from about 500 AD. Around 1200 the Swabian and East Franconian varieties of Middle High German became dominant as a court and poetry language (Minnesang) under the rule of the House of Hohenstaufen.