Jakob was born in 1413 in Sienno, the son of Dobisław of Oleśnicy a local aristocrat of the Debno family and his wife Catherine Oleśnicka, daughter of Dymitr of Goraj.

Eventually on 16 January 1462 the conflict was resolved through intersession of the papal legate Jerome Lando, Archbishop of Crete.

In Włocławek and in Gniezno he installed oak pew stalls and rich liturgical equipment, and donated to the library of Kraków Academy.

In 1465 he represented the King at the meeting with the Teutonic Knights in Toruń, that ended the Thirteen Years' War.

[8] He died 4 October 1480 in Łowicz and was buried in the Cathedral of Gniezno, where he erected a cross above the chancel.