Tilleda is a village and a former municipality in the Mansfeld-Südharz district, in the German state of Saxony-Anhalt.Tilleda is notable mainly for having been the site of a medieval Royal palace or Pfalz which has been partially excavated and reconstructed.The 972 marriage certificate of Emperor Otto II denotes a Kaiserpfalz (imperial palace) at Tilleda.[2]: 13–15 With the castle gradually falling into ruin, it was forgotten until the 19th century, when it was "discovered" by local historian Karl Meyer.From 1983 the area was made accessible to the public as an open-air museum, which reopened in its current form in 2001.