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Constantine was born a Scottish prince, the son of King Kenneth II of Strathclyde. Constantine led a life of vice until his conversion, possibly after hearing the evangelizing preaching of Saint Columba and Saint Kentigern.
Constantine was married, and the father of at least one son, and briefly king of Stathclyde. Widowed, he abdicated his position, founded a monastery at Govan on the river Clyde, became a monk there, and evangelized the region.
Constantine became a priest. He was an abbot of a monastery in Govan, Scotland as well. Martyr.
Older martyrologies have entries for Constantines of Strathclyde, of Cornwall, and of Rahan, Ireland; they run the details of their lives together, and they could have been one, two or three people.
Died
- bled to death in 874 in a cave near Crail after his right arm was cut off by Danish pirates
- considered a martyr in Scotland for defending his Christian land against pagan invaders
Canonized
- Pre-Congregation
Source: https://catholicsaints.info/saint-constantine-ii/