Radla was tutor and close friend of Adalbert (they both studied in Magdeburg) and accompanied him on his pilgrimage to Rome. After Slavník's were slaughtered (995) Radla left for Hungary where he stayed in the service of the wife of Duke Geza. Adalbert asked Radla to be his company on travel to Polish lands but Radla opted to stay in Hungary. Bruno of Querfurt, the creator of legend about St. Adalbert, met him there.
Radla is sometimes identified with Anastasius, the first abbot of Břevnov Monastery (from 993) or with Astrik (Anastasius), bishop of the Hungarians in Esztergom. Modern historians, however, are rather skeptical of these claims.
- Jiří Sláma, Rostislav Nový, Jana Zachová: "Slavníkovci ve středověkém písemnictví" (Slavník's in medieval literature), Prague, 1987
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