Wenceslaus is the subject of the popular Saint Stephen's Day (celebrated on December 26 in the West) Carol, "Good King Wenceslas".
It was published by John Mason Neale in 1853, and may be a translation of a poem by Czech poet Václav Alois Svoboda.

The usual American English spelling of Duke Wenceslas' name, Wenceslaus, is occasionally encountered in later textual variants of the carol, although it was not used by Neale in his version.
Wenceslas is not to be confused with King Wenceslaus I of Bohemia (Wenceslaus I Premyslid), who lived more than three centuries later.

The Day of Saint Wenceslas, 28 September 1914, was selected by Czech Companion in Russia for foundation in Kiev Sofia Square and the First Rifle Regiment of Czechoslovak legions there was originally named "The Rifle Regiment of Saint Wenceslas".

An equestrian statue of Saint Wenceslaus and other patrons of Bohemia (St. Adalbert, St. Ludmila, St. Prokop and St. Agnes of Bohemia) is located on Wenceslaus Square in Prague.
 The statue is a popular meeting place in Prague.
Demonstrations against the Communist regime were held there.

His helmet and armour are on display inside Prague Castle.
Wenceslaus is the subject of the popular Saint Stephen's Day (celebrated on December 26 in the West) Carol, "Good King Wenceslas". It was published by John Mason Neale in 1853, and may be a translation of a poem by Czech poet Václav Alois Svoboda.
The usual American English spelling of Duke Wenceslas' name, Wenceslaus, is occasionally encountered in later textual variants of the carol, although it was not used by Neale in his version. Wenceslas is not to be confused with King Wenceslaus I of Bohemia (Wenceslaus I Premyslid), who lived more than three centuries later.
The Day of Saint Wenceslas, 28 September 1914, was selected by Czech Companion in Russia for foundation in Kiev Sofia Square and the First Rifle Regiment of Czechoslovak legions there was originally named "The Rifle Regiment of Saint Wenceslas".
An equestrian statue of Saint Wenceslaus and other patrons of Bohemia (St. Adalbert, St. Ludmila, St. Prokop and St. Agnes of Bohemia) is located on Wenceslaus Square in Prague.  The statue is a popular meeting place in Prague. Demonstrations against the Communist regime were held there.
His helmet and armour are on display inside Prague Castle.
Wenceslaus I, Duke of Bohemia