Zbigniew, born in 1070, was the first-born son of Władysław I Herman and Przecława, possibly linked to the Prawdzic family. Despite being considered illegitimate, his early life took a significant turn when he was set on an ecclesiastical career following the birth of his half-brother, Bolesław Wrymouth. As the political landscape of Poland shifted at the end of the eleventh century, Zbigniew's return to Poland was catalyzed by the opposition of Silesian magnates against the Palatine Sieciech, leading to his recognition as a successor by his father.
In a complex web of familial alliances and political intrigue, Zbigniew and Bolesław united against their father’s second wife, Judith Maria, and the Palatine Sieciech. This alliance ultimately compelled Władysław I to divide the kingdom between his sons, exiling Sieciech in the process. Following their father's death, Zbigniew and Bolesław ruled as equals, but tensions soon arose as Zbigniew, being the elder, sought to assert his claim as the rightful heir.
The ensuing conflict between the brothers, known as the fratricidal war for supremacy, lasted from 1102 to 1106. Zbigniew's aspirations were thwarted, culminating in his complete defeat and subsequent exile to Germany. In a dramatic turn of events, Emperor Henry V invaded Poland in 1109 under the pretext of restoring Zbigniew, but his forces were repelled at Głogów.
Despite Bolesław's struggles against Bohemia and the pressures from Emperor Henry V, Zbigniew was eventually allowed to return to Poland in 1111, receiving a minor domain as part of the peace negotiations. Tragically, shortly after his return, Zbigniew was blinded and subsequently passed away, marking a poignant end to a life marked by conflict and ambition.