Dietrich I, Margrave of Lusatia
| Theodoric I | |
|---|---|
| Margrave of Lusatia | |
 |
|
| Reign | 1156–1185 |
| Predecessor | Conrad, Margrave of Meissen |
| Successor | Dedi III |
| Noble family | House of Wettin |
| Father | Conrad, Margrave of Meissen |
| Mother | Liutgard of Elchingen-Ravenstein |
| Born | ca. 1118 |
| Died | 9 February 1185 Petersberg |
Theodoric I (German: Dietrich von Landsberg; c. 1118 – 9 February 1185), a member of the House of Wettin, was Margrave of Lusatia from 1156 until his death.
Theoderic was the second surviving son of the Wettin margrave Conrad of Meissen. When his father retired in 1156 and was succeeded by his eldest son Otto II in Meissen, Theoderic received the Lusatian march (Orientalis marchio) formerly held by Henry of Groitzsch, including the castles of Eilenburg and Landsberg, from the hands of the Hohenstaufen emperor Frederick Barbarossa.
He married Dobroniega, daughter of the Polish Duke Bolesław III Wrymouth and his wife Salomea of Berg. She gave him a son, Conrad, who predeceased him, and a daughter, Gertruda, who became a nun. An illegitimate son Theodoric, by a mistress named Cunigunde, widowed Countess of Plötzkau, was legitimated on 12 May 1203 and became Bishop of Merseburg in 1204.
Though Theodoric at times called himself a "Margrave of Landsberg", a corresponding political entity was not established before 1261 by the Wettin margrave Henry III of Meissen. In 1165, Theodoric with the support of Bishop Werner of Płock founded Dobrilugk Abbey as a family monastery. He remained a firm supporter of Emperor Frederick Barbarossa in the 1157 campaign against High Duke Bolesław IV the Curly of Poland and again accompanied him on his Italian campaign of 1176/77 against the cities of the Lombard League. In the conflict with Henry the Lion, he actively fought the Saxon duke together with Archbishop Wichmann of Magdeburg and his brothers Margrave Otto II and Dedi of Groitzsch.
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