Saco vs Kaiserpfalz

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The term Kaiserpfalz (German: [ˈkaɪzɐˌpfalts], "imperial palace") or Königspfalz (German: [ˈkøːnɪçsˌpfalts], "royal palace", from Middle High German phal[en]ze to Old High German phalanza from Middle Latin palatia [plural] to Latin palatium "palace") refers to a number of castles and palaces across the Holy Roman Empire that served as temporary, secondary seats of power for the Holy Roman Emperor in the Early and High Middle Ages.

The term was also used more rarely for a bishop who, as a territorial lord (Landesherr), had to provide the king and his entourage with board and lodging, a duty referred to as Gastungspflicht.

Source: Wikipedia