Having beheaded the four brothers of Saint Adalbert with all their children before the altar itself, they burned down the burg, bathed the streets in blood, and returned cheerful to their own homes loaded with bloody spoils and cruel plunder.

- Cosmas of Prague, Chronica Boemorum[4]The concrete identities of the perpetrators and clients, as well as the nature of their motive, are the subjects of varying hypotheses and of further research.

[3] It is possible that the motive was the wealth of the Slavník clan and of their gords at Libice and Malín, situated on the trade routes to Silesia, Moravia, and Lesser Poland.

As the Slavnik's could have been or related to the White Croats, they became influenced by Poles because of which Soběslav probably did not support Boleslav II in his anti-Polish campaign which ended in defeat.

Přemyslids presumably perceived the events as devastating for their future and as a desperate measure decided to get rid of the Slavnik's dynasty and uniting whole of Bohemia under their rule.

However, he had a strained relationship with some local warriors, evidently of the Vrčovci family, who did not respect the ecclesiastical asylum, and, deaf to the bishop's exhortations, hauled the woman out of the church and beheaded her, despite her husband's opposition, before Adalbert's very eyes.

Historian Jiří Sláma, however, claims that it already existed, and that the real milestone in its foundation was Saint Wenceslaus' murder on 28 September 935 in Stará Boleslav, which was followed by a revolution in Bohemia that marks the beginning of the founding of a Bohemian state.