Tags: Noble.
Jan I of Żagań (Polish: Jan I żagański) (c. 1385 – 12 April 1439) was a Duke of Żagań-Głogów since 1397 (until 1412 with his brothers as co-rulers) since 1403 Duke of Żagań Krosno Odrzańskie and Świebodzin (again until 1412 with his brothers as co-rulers) and since 1412 sole ruler of Żagań and Przewóz.He was the eldest son of Henry VIII the Sparrow Duke of Głogów by his wife Katharina daughter of Duke Władysław of Opole.