Dietrich I, Margrave of Lusatia
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Theodoric I (circa. 1118 – 9 February 1185) was the Margrave of Lusatia (Orientalis marchio) from 1156 until his death. He was the second surviving son of Conrad, Margrave of Meissen and Lusatia
Conrad, Margrave of Meissen
Conrad the Great was the Margrave of Meissen from 1123 until his retirement in 1156. He was the son of Thimo, Count of Brehna, of the House of Wettin and Ida, daughter of Otto of Nordheim. He was also Count of Wettin, Brehna, and Camburg from before 1116.In 1123, he became Count of Eilenburg...

 from the House of Wettin, from whom he inherited the latter territory including Eilenburg
Eilenburg
Eilenburg is a town in Germany. It lies in the district of Nordsachsen in the Free State of Saxony, approximately 20 km northeast of the city of Leipzig.- Geography :...

 and Landsberg
Landsberg, Saxony-Anhalt
Landsberg is a town in the Saalekreis in the state of Saxony-Anhalt in Germany with about 12,000 inhabitants. Landsberg lies in the Greater Halle area....

 in 1156, while his elder brother Otto the Rich
Otto II, Margrave of Meissen
Otto II was the Margrave of Meissen from 1157 until his death in 1190. His father was Conrad the Great and his son was Dietrich I, Margrave of Meissen. He is a direct patrilineal ancestor of Queen Elizabeth II of the United Kingdom, King Albert II of Belgium and Simeon II of Bulgaria....

 inherited Meissen.

He married Dobroniega, daughter of the Polish Duke Bolesław III Wrymouth. She gave him a son, who predeceased him, and a daughter, who became a nun. His illegitimate son Theodoric, by a mistress named Cunigunde, widowed Countess of Plötzkau
Plötzkau
Plötzkau is a municipality in the district of Salzlandkreis, in Saxony-Anhalt, Germany....

, was legitimated on 12 May 1203 and became Bishop of Merseburg
Bishopric of Merseburg
The Bishopric of Merseburg was a episcopal see on the eastern border of the mediæval Duchy of Saxony with its centre in Merseburg, where Merseburg Cathedral was constructed...

 in 1204.

Though Theodoric at times called himself a "Margrave of Landsberg"
Margraviate of Landsberg
The Margraviate of Landsberg was a march of the Holy Roman Empire that existed from the 12th to the 14th century. It was named after Landsberg Castle in present-day Saxony-Anhalt...

, a corresponding political entity was not established before 1261 by Margrave Henry III of Wettin
Henry III, Margrave of Meissen
Henry III, called Henry the Illustrious from the House of Wettin was Margrave of Meissen and last Margrave of Lusatia from 1221 until his death; from 1242 also Landgrave of Thuringia.-Life:Born probably at the Albrechtsburg residence in Meissen, Henry was the youngest son of Margrave Theodoric I...

. In 1165, Theodoric founded Dobrilugk Abbey
Dobrilugk Abbey
Dobrilugk Abbey was a Cistercian monastery in Lower Lusatia in the territory of the present town of Doberlug-Kirchhain, Brandenburg, Germany.-History:...

. He was a firm supporter of Emperor Frederick I Barbarossa
Frederick I, Holy Roman Emperor
Frederick I Barbarossa was a German Holy Roman Emperor. He was elected King of Germany at Frankfurt on 4 March 1152 and crowned in Aachen on 9 March, crowned King of Italy in Pavia in 1155, and finally crowned Roman Emperor by Pope Adrian IV, on 18 June 1155, and two years later in 1157 the term...

 in the 1157 campaign against High Duke Bolesław IV the Curly of Poland and in the conflict with Henry the Lion
Henry the Lion
Henry the Lion was a member of the Welf dynasty and Duke of Saxony, as Henry III, from 1142, and Duke of Bavaria, as Henry XII, from 1156, which duchies he held until 1180....

.

Theodoric died at Petersberg
Petersberg, Saxony-Anhalt
Petersberg is a municipality in the Saalekreis district, Saxony-Anhalt, Germany....

 Abbey and was buried there. His margraviate passed to his brother Dedo III of Groitzsch upon his death.

Sources

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