Otto III of Carinthia
| Otto III | |
|---|---|
| Duke of Carinthia | |
 |
|
| Spouse(s) | Euphemia of Legnica |
| Noble family | Meinhardiner |
| Father | Meinhard, Duke of Carinthia |
| Mother | Elisabeth of Bavaria |
| Born | c. 1265 |
| Died | 25 May 1310 |
Otto III (c. 1265 – 25 May 1310), a member of the House of Gorizia (Meinhardiner dynasty), was Duke of Carinthia and Count of Tyrol from 1295 until his death. He ruled jointly with his younger brothers Louis and Henry VI.
Otto was a son of Duke Meinhard of Carinthia and his wife Elisabeth of Bavaria, widow of the Hohenstaufen king Conrad IV of Germany. His father was enfeoffed with the Carinthian duchy by King Rudolf I of Germany in 1286, in turn for his support of the Habsburgs against King Ottokar II of Bohemia. Otto's sister Elizabeth was married to Rudolf's son Albert of Habsburg and became German queen in 1298.
When Duke Meinhard died in 1295, his sons inherited a well-organized country, as their father had laid the foundation for an efficient administration by fostering ministeriales and creating the Tyrolean Raitbuch (internal record book). Otto signed a border treaty with the neighbouring Bishopric of Brixen, establishing the confluence of the Adige and the Avisio as the border between Tyrol and Brixen. Otto's brothers Albert (d. 1292), Louis and Henry VI were appointed Vogts of the Bishops of Trent.
Otto's brother-in-law Albert of Habsburg, elected King of the Romans in 1298, granted him several tolls. However, Otto's lavish court was a burden on his finances. Most notable of his economic policies was the expansion and securing of the market in Gries (now part of Bolzano) in 1305 competing with the market in the central town of Bolzano, which was dominated by the bishop.
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