During 1444–1452 Bolko V led a fight against the Bishop of Kraków, Zbigniew Oleśnicki, over the buying of the Duchy of Siewierz.
One of his first decisions was not recognized the purchase of Siewierz by the Bishop of Kraków, Zbigniew Oleśnicki.
His first decision as an independent ruler was caught up in conflict with the Bishop of Kraków, Zbigniew Oleśnicki, who purchased Siewierz from the Dukes of Cieszyn.
On 30 December 1443, Zbigniew Oleśnicki, the bishop of Kraków, bought Sewer/Siewierz from Wacław I of Teschen, who was deeply in debts then.
Zbigniew Brzezinski | Zbigniew Karkowski | Zbigniew Zamachowski | Zbigniew Preisner | Zbigniew Oleśnicki | Zbigniew Karpus | Zbigniew Boniek | Zbigniew of Poland | Zbigniew Babiński | Zbigniew Ziobro | Zbigniew Rybczyński | Zbigniew Olesnicki | Zbigniew Jagiełło | Zbigniew Gołąb | Zbigniew Czajkowski | Zbigniew Brzeziński |
Among them were Dobieslaw Oleśnicki, the castellan of Wojnicz, Lublin and Sandomierz, the starosta of Krakow, who participated in the Battle of Grunwald and commanded the siege of the Malbork Castle in 1410, and Cardinal Zbigniew Olesnicki, the Bishop of Krakow in 1423–1455, as well as many members of the Zborowski family.