According to Canaprius and Bruno of Querfurt, Slavnik was a noble ruler, and although he ruled over a vast territory and had plenty of gold and silver and minions, he was a humble man, generous towards to the poor people. His wife Střezislava, a noble woman characterized by modesty and compassion, came from a noble Slavic family, "worthy of his royal blood". As such, they were appreciated by both nobles and common people. Slavník had at least 6 sons, among whom two – Vojtěch (Adalbert) and the illegitimate Radim (Gaudentius) – later became saints.