Lothair III, sometimes numbered Lothair II and also known as Lothair of Supplinburg (1075 – 4 December 1137), was Holy Roman Emperor from 1133 until his death. He was appointed Duke of Saxony in 1106 and elected King of Germany in 1125 before being crowned emperor in Rome. The son of the Saxon count Gebhard of Supplinburg, his reign was troubled by the constant intriguing of the Hohenstaufens, Duke Frederick II of Swabia and Duke Conrad of Franconia. He died while returning from a successful campaign against the Norman Kingdom of Sicily. Rise to power In 1013, a certain Saxon nobleman named Liutger was mentioned as a count in or of the Harzgau subdivision of Eastphalia. His grandson Count Gebhard, father of Emperor Lothair, possibly acquired the castle of Süpplingenburg about 1060 via his marriage with Hedwig, a daughter of the Bavarian count Frederick of Formbach and his wife Gertrud, herself a descendant of the Saxon margrave Dietrich of Haldensleben who secondly married the Billung duke Ordulf of Saxony upon Count Frederick's death. Little is known of Lothair's youth. His name first appears in the contemporary records in 1088. His father Gebhard of Supplinburg joined the Saxon Rebellion against the ruling Salian dynasty and died on 9 June 1075 in the Battle of Langensalza, fighting troops loyal to emperor Henry IV. Shortly after Gebhard's death Lothair was born at Unterlüß. In 1107 he married Richenza, daughter of Count Henry of Northeim and Gertrude of Brunswick, heiress of the Brunonids. Lothair's land purchases, inheritance and marriage alliances among the Saxon nobles, resulted in the acquisition of the domains of the House of Billung and the Counts of Northeim. The marriage with Richenza of the Brunonids in particular, made him the wealthiest nobleman among his fellow Saxons. He supported future emperor Henry V during his 1104 rebellion against his father Henry IV, and the ensuing disempowerment campaign, that culminated in the abdication of the emperor on December 31, 1105 and his son's coronation a few days later. For his loyalty Lothair was rewarded with the fief of title and estate of the Duchy of Saxony upon the death of duke Magnus of Billung, who had died without an heir in 1106. Emboldened by the promotion and incensed over the king's increasingly autocratic rule, such as the wanton imposition of a new tax on ducal lords, Duke Lothair joined the growing opposition party