An eleventh-century Milanese deacon who led the Pataria reform movement against simony and clerical concubinage, murdered by his opponents in 1066 for his preaching.

Saint Ariald of Milan, also written Arialdo, was an eleventh-century deacon and church reformer who became one of the leaders of the Pataria, a lay-and-clergy reform movement in Milan aimed at ending the sale of church offices and the practice of clergy living with wives or concubines in defiance of Church discipline. Alongside figures such as Anselm da Baggio, who later became Pope Alexander II, Ariald preached openly against Archbishop Guido da Velate and the corrupt clergy who supported him, provoking repeated violent clashes in the city and several periods of exile. He was ultimately captured by his opponents in 1066 and killed near Lake Maggiore, his body mutilated before it was later recovered and honored by his supporters in Milan. His cultus, maintained in Milan across the centuries, was formally confirmed by the Holy See through an equipollent canonization in 1904.

Quick Facts

• Born: traditionally around 1010, in Cucciago, Italy (date uncertain)
• Died: June 27, 1066, near Lake Maggiore, Italy, traditionally at about age 55
• Feast Day: June 27
• Canonized: 1904 (equipollent canonization, confirming an ancient local cultus)
• Patron of: no formal universal patronage; venerated locally in Milan as a witness for church reform

Who Was Saint Ariald of Milan?

Ariald was born, by tradition, around 1010 in Cucciago in northern Italy, and by the middle of the eleventh century was serving as a deacon in Milan, one of the most important and turbulent sees in Western Christendom at the time. He became a leading figure of the Pataria, a reform movement that arose in Milan in the 1050s among clergy and laypeople alarmed by simony, the buying and selling of church offices, and by the widespread practice of priests living openly with wives or concubines in defiance of clerical celibacy. Working closely with Anselm da Baggio, a fellow reformer who later became Pope Alexander II, and with the layman Landulf Cotta, Ariald preached forcefully against these abuses and against Archbishop Guido da Velate, who tolerated or benefited from them. His preaching provoked violent unrest in Milan, repeated riots between reformers and their opponents among the city’s clergy and nobility, and forced Ariald into exile from the city on more than one occasion. In 1066, during renewed conflict, he was captured by men loyal to the archbishop’s faction, taken to an island in the region of Lake Maggiore, and killed, his body reportedly mutilated before being hidden. His remains were later recovered by supporters and brought back to Milan, where his memory as a martyr for reform took firm hold.

Historical Setting

Ariald’s activity in Milan belongs to the broader eleventh-century movement for church reform that would culminate in what historians call the Gregorian Reform, associated above all with Pope Gregory VII, though the Pataria in Milan predates and helped shape that wider papal effort. The movement’s core concerns, ending simony and enforcing clerical celibacy, reflected genuine and widespread problems in the eleventh-century Church, where church offices were frequently bought, sold, or controlled by secular power, and clergy often lived much like the laypeople around them. Milan’s particular volatility, with its powerful archbishop, restless nobility, and engaged urban population, made it one of the most intense battlegrounds of this broader reform struggle.

Why the Church Venerates Saint Ariald of Milan

Ariald is venerated as a martyr for the cause of church reform, killed specifically because his uncompromising preaching against simony and clerical corruption threatened the interests of those who benefited from the status quo. The Church honors him for the personal cost of that stand, repeated exile and ultimately a violent death, and for his role, alongside better-known figures like the future Pope Alexander II, in a movement that helped set the direction of church reform for the following generations.

Canonization and Feast Day

No formal medieval canonization process examined Ariald’s cause in his own era. The Holy See’s 1904 act was an equipollent canonization, confirming the cultus that had already been maintained in Milan since his death rather than opening a new inquiry into miracles. His feast is observed on June 27, the anniversary of his death.

What Catholics Can Learn Today

Ariald’s willingness to name corruption within his own Church, at real personal cost, remains a challenging example for every era, including the present one. His story shows that calling the Church back to its own standards has always required courage aimed inward as much as outward, and that such calls have historically provoked real resistance, sometimes violent. His memory encourages readers to support honest reform within religious institutions today, while also recognizing how easily zeal for reform can inflame conflict, a tension his own turbulent career embodies.

A Prayer to Saint Ariald of Milan

Saint Ariald of Milan, deacon who would not stay silent before corruption in the household of the Church, you paid for your preaching with exile and finally with your life. Obtain for us the courage to speak truthfully about failings within our own communities of faith, tempered always by charity. Pray for all who labor for honest reform in the Church today, that they may combine your boldness with a wisdom you did not always have time to learn. Amen.

Sources

• the Catholic Encyclopedia (New Advent), entry on the Pataria
• the Roman Martyrology
• Butler’s Lives of the Saints
• the historical records of the Archdiocese of Milan