Fintan of Rheinau

Fintan of Rheinau "(Findan, Findanus)" (803–804 in Leinster, Ireland, 15 November 878 in Rheinau, Switzerland) was an Irish Catholic hermit who settled in Rheinau. In the Catholic Church he is venerated as a saint.
Life.
Fintan was born in the Leinster, Ireland in a noble family. He lost his parents and siblings in internal wars in Ireland and through abductions by the Vikings. He himself was enslaved by the Vikings (possibly handed over by his Irish enemies) and taken to the Orkney Islands, but was able to escape to Scotland. There he stayed with a bishop for two years, and became a clergyman. In 845 he made a pilgrimage through the Frankish Empire to Rome. From there he went to the monastery of Farfa where he lived as a monk for some time, then via Rhaetia to Swabia, or to the landgraviate of Klettgau, where he entered the service of the Alemannic nobleman Wolvene. Wolvene persuaded him after a few years to join his monastery in Rheinau as a monk, which he did in 851. From the year 856 he lived there walled in as an incluse until his death. His bones are kept in the Rheinau monastery church in the reliquary in the Fintan altar. Shortly after his death, the Vita Findani was written by a confrere of the monastery, it is considered reliable. His attributes in church art are a dove, a ducal hat and the monks' habit.
His biography, the Vita Findani, is considered to be a relatively accurate description of Viking age slave trade. Interwoven with the story of Melkorka from the Icelandic Laxdaela-Saga, it has been the been the basis of the Austrian-German-French documentary "Victims of the Vikings" (ORF/ZDF/Arte 2021).