Konrad III the Old (Polish: Konrad III Stary) (ca. 1359 – 28 December 1412) was a Duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa since 1377 (until 1403 with his father as co-ruler).
He was the only son of Konrad II the Gray, Duke of Oleśnica, by his wife Agnes, daughter of Casimir I, Duke of Cieszyn.
In 1377 his father named him co-ruler of all his lands, as his only son and heir. Konrad III began his reign alone only in 1403, after his father's death. Little is known about his reign.
By 1380 he married with Judith (also named Jutta or Guta) (d. 26 June 1416), whose originis are unknown. They had seven children:
Preceded by Konrad II the Gray |
Duke of Oleśnica with Konrad II (until 1403) 1377–1412 |
Succeeded by Konrad IV the Older and Konrad V Kantner |
Duke of Koźle with Konrad II (until 1403) 1377–1412 |
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Duke of Bytom (1/2) with Konrad II (until 1403) 1377–1412 |
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Duke of Ścinawa (1/2) with Konrad II (until 1403) 1377–1412 |