In September 935, a group of nobles allied with Wenceslas's younger brother Boleslav plotted to kill him.
After Boleslav invited Wenceslas to the feast of Saints Cosmas and Damian in Stará Boleslav, three of Boleslav's companions, Tira, Česta, and Hněvsa, fell on the duke and stabbed him to death.
As the duke fell, Boleslav ran him through with a lance.

According to Cosmas of Prague, in his Chronica Boëmorum of the early 12th century, one of Boleslav's sons was born on the day of Wenceslas's death.
Because of the ominous circumstance of his birth, the infant was named Strachkvas, which means "a dreadful feast".

There is also a tradition that Wenceslas's loyal servant Podevin avenged his death by killing one of the chief conspirators, but was executed by Boleslav.
In September 935, a group of nobles allied with Wenceslas's younger brother Boleslav plotted to kill him. After Boleslav invited Wenceslas to the feast of Saints Cosmas and Damian in Stará Boleslav, three of Boleslav's companions, Tira, Česta, and Hněvsa, fell on the duke and stabbed him to death. As the duke fell, Boleslav ran him through with a lance.
According to Cosmas of Prague, in his Chronica Boëmorum of the early 12th century, one of Boleslav's sons was born on the day of Wenceslas's death. Because of the ominous circumstance of his birth, the infant was named Strachkvas, which means "a dreadful feast".
There is also a tradition that Wenceslas's loyal servant Podevin avenged his death by killing one of the chief conspirators, but was executed by Boleslav.
Wenceslaus I, Duke of Bohemia