In 1428 Kobylański led the Polish mercenary troops which served under Grand Duke Vytautas and took part in the fighting between the Grand Duke and Veliky Novgorod.
Jakub Karol Parnas | Jakub Arbes | Jakub Zadzik | Jakub Petelewicz | Jan Jakub Kotík | Jakub Vrzáň | Jakub Šulc | Jakub Sobieski | Jakub Kubicki | Jakub Kryštof Rad | Jakub Deml | Jakub Błaszczykowski |