Holy Roman Emperor Lothair III

Holy Roman Emperor Lothair III
Name	Lothair III
Birth date	c. 1075
Death date	4 December 1137
Burial	Saint-Denis?
Spouse	Sibylla of Burgundy
Issue	Sibyl of Anjou; Gertrude of Süpplingenburg; Conrad of Germany (d. young)
House	Süpplingenburg
Father	Gebhard of Süpplingenburg
Mother	Hedwig of Formbach
Religion	Roman Catholicism

Holy Roman Emperor Lothair III was a medieval ruler who reigned as King of Germany from 1125 and was crowned Holy Roman Emperor in 1133. A scion of the Süpplingenburg family and duke of Saxony, he navigated the fractious politics of the Salian dynasty aftermath, the Investiture Controversy, and the competing claims of princes such as the Hohenstaufen and Welf houses. His reign was marked by Italian expeditions, papal negotiations, and contested succession that reshaped the balance between imperial authority and princely autonomy.

Early life and family

Born circa 1075 into the comital house of Süpplingenburg, Lothair was son of Gebhard of Supplinburg and Hedwig of Formbach, linking him to networks of Saxon nobility, Thuringian magnates, and the Welf-aligned aristocracy. His marriage to Sibylla of Burgundy allied him with Burgundian and Capetian interests and produced daughters who contracted marriages with principal dynasties: Sibyl of Anjou engaged ties to the Angevin sphere, while Gertrude of Süpplingenburg later married Henry X, Duke of Bavaria of the Welf family and then Henry II of Austria of the Babenberg lineage. Lothair’s kinship links connected him to the courts of King Louis VI of France, Count Fulk V of Anjou, and the princely networks of Burgundy and Flanders.

Accession and kingship of Germany

Following the death of Henry V, Holy Roman Emperor in 1125, the imperial electoral assembly of princes, bishops, and magnates rejected continuation of the Salian dynasty and elected Lothair as king at an assembly in Frankfurt. Supported by influential ecclesiastics including Adalbert of Mainz and secular leaders wary of Frederick II of Swabia (later Frederick I, Duke of Swabia), Lothair secured recognition against the claims of the Hohenstaufen brothers Frederick II and Conrad III's father? and the rival Welf princes. His kingship faced immediate challenges from Duke Henry the Proud of the Welfs and the rising Hohenstaufen power; Lothair used coronation oaths, assemblies at Regensburg and Paderborn, and grants to bishops such as Adalbert of Bremen to consolidate royal authority.

Coronation as Holy Roman Emperor and Italian campaigns

After securing German kingship, Lothair led an Italian expedition to assert imperial prerogatives and to be crowned by Pope Innocent II in Rome in 1133. The Italian campaign involved negotiation and military operations against Roger II of Sicily, who had consolidated control over Southern Italy and contested papal and imperial claims. Lothair’s Roman coronation was staged amid the papal schism between Innocent II and Anacletus II and in the context of alliances with Cardinal Aimeric and the Roman aristocracy. His Italian presence also intersected with the affairs of the Norman Kingdom of Sicily, the County of Apulia, and maritime republics such as Genoa and Pisa.

Relations with the Papacy and Investiture politics

Lothair’s reign unfolded against the ongoing Investiture Controversy and the reformist papacy’s contest with imperial appointment rights. He cultivated a pragmatic alliance with Pope Innocent II to legitimize his imperial title and to oppose Norman influence; in return he affirmed certain papal privileges while seeking imperial investiture rights for key bishoprics in Germany. Negotiations involved figures like Bernard of Clairvaux who supported papal reform, and disputes touched the role of archbishops such as Adalbert of Mainz and Anselm of Canterbury's legacy of investiture debate. His policy attempted a balance: recognizing papal spiritual authority while preserving imperial influence over episcopal temporalities and imperial fiefs.

Domestic policy and administration

Domestically, Lothair relied on alliances with princes, bishops, and ministeriales to administer Germany, holding diets at centers like Quedlinburg, Worms, and Magdeburg. He patronized ecclesiastical reformers and confirmed privileges to monasteries including Cluny and Reichenau, while using royal benefices to reward supporters such as Count Conrad of Marburg and Albert the Bear’s predecessors. Confrontations with powerful dukes—notably the Welfs and Hohenstaufen claimants—led to the temporary confiscation and redistribution of ducal possessions, affecting the territorial politics of Bavaria, Saxony, and Swabia and shaping the pattern of princely autonomy in the later 12th century.

Military campaigns and foreign relations

Beyond Italy, Lothair engaged in campaigns and diplomacy with neighboring polities: contested borders with the Kingdom of France under Louis VI, alliances with Flanders and Brabant magnates, and interventions in Bohemian and Polish affairs involving dukes like Soběslav I and Bolesław III Wrymouth. Naval and mercantile ties with Venice and Genoa influenced his Mediterranean policy. Military operations against the Norman rulers in southern Italy and actions to secure Rhineland routes brought him into contact with urban communes such as Cologne and Mainz which supplied levies and logistical support.

Death, legacy, and succession

Lothair died on 4 December 1137, leaving a contested succession that precipitated renewed struggle between the Welf candidate Henry the Proud and the emerging Hohenstaufen claimant Conrad III. His daughter Gertrude of Süpplingenburg’s marriage to Henry X, Duke of Bavaria tied his legacy to the Welfs and ultimately the House of Hohenstaufen’s rise. Historians link Lothair’s reign to the stabilization of royal election norms, the entrenchment of princely powers in Germany, and the redefinition of imperial relations with the papacy and Italian principalities; his Italian coronation and campaigns influenced subsequent Frederick I Barbarossa’s policies and the trajectory of 12th-century imperial politics.

Category:Holy Roman Emperors Category:12th-century monarchs