Arialdo
Italian saint
Feast: 27 June (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Who they were
Arialdo, of noble birth, was born at Cutiacum near Milan, studied at Laon and Paris, and became a canon of Milan. He preached against the simony and immorality of the Milanese clergy; excommunicated for it by Archbishop Guido, he was reinstated by Pope Stephen, who told him to carry on the reform.
After a riot in which he was badly hurt and an earlier attempt on his life, he was set upon and killed by Guido's men in 1065 while on his way to Rome. Ten months later his body was found in Lake Maggiore, perfectly preserved. In 1067 Pope Alexander II declared him a martyr.
The miracles
As a martyr he was declared so by Pope Alexander II in 1067, before the Church's formal processes began.
Why that counted as sanctity
A canon who gave his life to reform a corrupt clergy.
- Catholic Encyclopedia (1913), via New Advent - St. Arialdus
- Wikidata Q654678 — dates, feast day and identifiers (CC0)
- English Wikipedia — Arialdo (CC BY-SA)
Checked against the sources listed on 21 September 2026. Corrections welcome.