LOTHAIR I. (795-855), Roman emperor, was the eldest son
of the emperor Louis I., and his wife Irmengarde. Little is
known of his early life, which was probably passed at the court
of his grandfather Charlemagne, until 815 when he became
ruler of Bavaria. When Louis in 817 divided the Empire between
his sons, Lothair was crowned joint emperor at Aix-la-Chapelle
and given a certain superiority over his brothers. In 821 he
married Irmengarde (d. 851), daughter of Hugo, count of Tours;
in 822 undertook the government of Italy; and, on the 5th of
April 823, was crowned emperor by Pope Paschal I. at Rome.
In November 824 he promulgated a statute concerning the
relations of pope and emperor which reserved the supreme
power to the secular potentate, and he afterwards issued various
ordinances for the good government of Italy. On his return to
his father’s court his stepmother Judith won his consent to her
plan for securing a kingdom for her son Charles, a scheme which
was carried out in 829. Lothair, however, soon changed his
attitude, and spent the succeeding decade in constant strife
over the division of the Empire with his father. He was
alterneately master of the Empire, and banished and confined to Italy;
at one time taking up arms in alliance with his brothers and
at another fighting against them; whilst the bounds of his
appointed kingdom were in turn extended and reduced. When
Louis was dying in 840, he sent the imperial insignia to Lothair,
who, disregarding the various partitions, claimed the whole
of the Empire. Negotiations with his brother Louis and his
half-brother Charles, both of whom armed to resist this claim,
were followed by an alliance of the younger brothers against
Lothair. A decisive battle was fought at Fontenoy on the 25th
of June 841, when, in spite of his personal gallantry, Lothair
was defeated and fled to Aix. With fresh troops he entered
upon a war of plunder, but the forces of his brothers were too
strong for him, and taking with him such treasure as he could
collect, he abandoned to them his capital. Efforts to make
peace were begun, and in June 842 the brothers met on an
island in the Sâone, and agreed to an arrangement which
developed, after much difficulty and delay, into the treaty of
Verdun signed in August 843. By this Lothair received Italy
and the imperial title, together with a stretch of land between
the North and Mediterranean Seas lying along the valleys of
the Rhine and the Rhone. He soon abandoned Italy to his
eldest son, Louis, and remained in his new kingdom, engaged
in alternate quarrels and reconciliations with his brothers, and
in futile efforts to defend his lands from the attacks of the
Normans and the Saracens. In 855 he became seriously ill,
and despairing of recovery renounced the throne, divided his
lands between his three sons, and on the 23rd of September
entered the monastery of Prüm, where he died six days later.
He was buried at Prüm, where his remains were found in 1860.
Lothair was entirely untrustworthy and quite unable to maintain
either the unity or the dignity of the empire of Charlemagne.
See “Annales Fuldenses”; Nithard, “Historiarum Libri,” both in the Monumenta Germaniae historica. Scriptores, Bände i. and ii. (Hanover and Berlin, 1826 fol.); E. Mühlbacher, Die Regesten des Kaiserreichs unter den Karolingern (Innsbruck, 1881); E. Dümmler, Geschichte des ostfränkischen Reichs (Leipzig, 1887-1888); B. Simson, Jahrbücher des deutschen Reiches unter Ludwig dem Frommen (Leipzig, 1874-1876).
LOTHAIR II. or III. (c. 1070-1137), surnamed the “Saxon,” Roman emperor, son of Gebhard, count of Supplinburg, belonged to a family possessing extensive lands around Helmstadt in Saxony, to which he succeeded on his father’s death in 1075. Gebhard had been a leading opponent of the emperor Henry IV. in Saxony, and his son, taking the same attitude, assisted Egbert II., margrave of Meissen, in the rising of 1088. The position and influence of Lothair in Saxony, already considerable, was increased when in 1100 he married Richenza, daughter of Henry, count of Nordheim, who became an heiress on her father’s death in 1101, and inherited other estates when her brother Otto died childless in 1116. Having assisted the German king, Henry V., against his father in 1104, Lothair was appointed duke of Saxony by Henry, when Duke Magnus, the last of the Billungs, died in 1106. His first care was to establish his authority over some districts east of the Elbe; and quickly making himself independent of the king, he stood forth as the representative of the Saxon race. This attitude brought him into collision with Henry V., to whom, however, he was forced to submit after an unsuccessful rising in 1112. A second rising was caused when, on the death of Ulrich II., count of Weimar and Orlamünde, without issue in 1112, Henry seized these counties as vacant fiefs of the empire, while Lothair supported the claim of Siegfried, count of Ballenstädt, whose mother was a relative of Ulrich. The rebels were defeated, and Siegfried was killed at Warnstädt in 1113, but his son secured possession of the disputed counties. After the defeat by Lothair of Henry’s forces at Welfesholz on the 11th of February 1115, events called Henry to Italy; and Lothair appears to have been undisturbed in Saxony until 1123, when the death of Henry II., margrave of Meissen and Lusatia raised a dispute as to the right of appointment to the vacant margraviates. A struggle ensued, in which victory remained with the duke. The Saxony policy of Lothair during these years had been to make himself independent, and to extend his authority; to this end he allied himself with the papal party, and easily revived the traditional hostility of the Saxons to the Franconian emperors.
When Henry V. died in 1125, Lothair, after a protracted election, was chosen German king at Mainz on the 30th of August 1125. His election was largely owing to the efforts of Adalbert, archbishop of Mainz, and the papal party, who disliked the candidature of Henry’s nephew and heir, Frederick II. of Hohenstaufen, duke of Swabia. The new king was crowned at Aix-la-Chapelle on the 13th of September 1125. Before suffering a severe reverse, brought about by his interference in the internal affairs of Bohemia, Lothair requested Frederick of Hohenstaufen to restore to the crown the estates bequeathed to him by the emperor Henry V. Frederick refused, and was placed under the ban. Lothair, unable to capture Nüremberg, gained the support of Henry the Proud, the new duke of Bavaria, by giving him his daughter, Gertrude, in marriage, and that of Conrad, count of Zähringen, by granting him the administration of the kingdom of Burgundy, or Arles. As a counterstroke, however, Conrad of Hohenstaufen, the brother of Frederick, was chosen German king in December 1127, and was quickly recognized in northern Italy. But Lothair gained the upper hand in Germany, and by the end of 1129 the Hohenstaufen strongholds, Nüremberg and Spires, were in his possession. This struggle was accompanied by disturbances in Lorraine, Saxony and Thuringia, but order was soon restored after the resistance of the Hohenstaufen had been beaten down. In 1131 the king led an expedition into Denmark, where one of his vassals had been murdered by Magnus, son of the Danish king, Niels, and where general confusion reigned; but no resistance was offered, and Niels promised to pay tribute to Lothair.
The king’s attention at the time was called to Italy where two popes, Innocent II. and Anacletus II., were clamouring for his support. At first Lothair, fully occupied with the affairs of Germany, remained heedless and neutral; but in March 1131 he was visited at Liége by Innocent, to whom he promised his assistance. Crossing the Alps with a small army in September 1132, he reached Rome in March 1133, accompanied by Innocent. As St Peter’s was held by Anacletus, Lothair’s coronation as emperor took place on the 4th of June 1133 in the church of the Lateran. He then received as papal fiefs the vast estates of Matilda, marchioness of Tuscany, thus securing for his daughter and her Welf husband lands which might otherwise have passed to the Hohenstaufen. His efforts to continue the investiture controversy were not very serious. He returned to Germany, where he restored order in Bavaria, and made an expedition against some rebels in the regions of the lower Rhine. Resuming the struggle against the Hohenstaufen, Lothair soon obtained the submission of the brothers, who retained their lands, and a general peace was sworn at Bamberg. The emperor’s authority was now generally recognized, and the annalists speak highly of the peace and order of his later years. In 1135, Eric II., king of Denmark, acknowledged himself a vassal of Lothair;
