Anglo-Saxon burial objects made of Harz ore were also excavated in England. Mining on the Rammelsberg was first mentioned in the records around 968 by the Saxon chronicler, Widukind of Corvey. According to his "Res gestae saxonicae", Emperor Otto the Great had silver ore deposits () opened and extracted. The mining settlement of Goslar was not mentioned until 979. In 1005, attracted by the presence of silver, King Henry II of Germany had the Imperial Palace of Goslar ("Kaiserpfalz Goslar") built at the foot of Mt. Rammelsberg, which, extended by his Salian successors Conrad II and Henry III, gradually replaced the former Royal palace of Werla. The profitable mines remained a "Reichsgut" directly belonging to the Holy Roman Emperor. When in 1175 Emperor Frederick Barbarossa called for support on his campaign against the Italian cities of the Lombard League, the Welf duke Henry the Lion demanded his enfeoffment with the Goslar mines in return, which Frederick denied. Duke Henry laid siege to the town and had the mining installations demolished. Restored after his deposition in 1180, the Rammelberg mines were again contested in 1198/99 during the Welf-Hohenstaufen throne quarrel between his son Otto IV and Frederick's son Philip of Swabia. After Imperial influence waned, the mines were held in pledge by the council of the Imperial city of Goslar, who officially purchased the entitlement to the rights and royalties from mining ("Bergregal") in 1359. A mining accident is documented in 1376, when more than 100 miners were buried and killed. The main ores mined at Rammelsberg were lead-zinc ore, copper ore, sulphur ore, mixed ore ("Melierterz"), brown spar ("Braunerz"), barite ore ("Grauerz"), banding ore ("Banderz") and kniest along with the important minerals of galena, chalcopyrite, sphalerite, baryte and vitriols. The chief metals extracted from these ores included silver, lead, copper and zinc, on which the wealth of Goslar was based. The Goslar mines for centuries had been a thorn in the side of the Dukes of Brunswick-Wolfenbüttel ruling over the adjacent Harz estates. In 1552 - after decades of legal proceedings, feuds and skirmishing - Duke Henry V took the occasion of the city's weakened position upon the Schmalkaldic War and seized ownership of the mines from the citizens.