Around the year 900 there was a Slavic castle on a mountain spur above the Eger, the foundation walls of which with a cemetery came to light in 1900 during an excavation under the Eger city archivist and museum director Karl Siegl. Around 1120, the surrounding Egerland was by colonization and Christianization meanwhile part of the Nordgau (Bavaria), was under Margrave Diepold III. von Vohburg built a castle complex on the mountain spur. This became an administrative center of the Holy Roman Empire when the Egerland came to the Hohenstaufen as an inheritance in 1167. From 1179, after the first stay of Emperor Friedrich Barbarossa in the imperial city of Eger (Cheb), the castle complex was expanded to become an imperial palace. The impressive Romanesque hall, the black tower and the double chapel of St. Martin were built by 1189. The upper chapel of St. Erhard and St. Ursula was designed from 1180 to 1220. After the end of the Staufer period, part of the Egerland was given to the King of Bohemia by pledge, who used the Eger Castle for festivities and representation until 1471. Then the imperial city of Eger, secured by a city wall with guarded gates, became the owner of the facility again and stationed a mercenary troop under a mercenary captain in the outer bailey. After a fire in 1472, the building's living and entrance areas were rebuilt.
Source and further information
de.wikipedia.org/wiki/Burg_Cheb