[1] Radim was an illegitimate son of Bohemian nobleman Slavník, and thus the half-brother of Adalbert of Prague.

Boniface and Alexius on the Aventine, with Radim adopting the name Gaudencius[2] or Gaudentius.

Surviving the mission fatal to his half-brother, back in Rome he related the events of the journey to Abbot John Canaparius, who wrote a biography of Adalbert, and worked to promote his canonization.

In Czech Republic he is commemorated as Saint Radim in the national liturgical calendar with an optional memorial on Oct. 12.

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