Ceslaus
Male·July 16·Poland·12th century
Ceslaus was a Polish nobleman and a Dominican friar, known for his missionary work and intercessory prayers. He is venerated as a Blessed, with his cult confirmed by Pope Clement XI.
Key Facts
- ›Ceslaus was born in Kamień ŚLąski, Poland, into the noble Odrowąż family.
- ›He studied philosophy in Prague and theology and law in Bologna.
- ›He joined the Order of Friars Preachers in 1220, receiving the habit from Dominic of Guzmán.
- ›Ceslaus undertook missionary work in Bohemia, Poland, Pomerania, and Saxony.
- ›He was chosen as the Provincial Superior for Poland.
- ›During the Mongol invasion, Ceslaus is credited with miraculously averting calamity in Wrocław through his prayers.

Czesław
Dominicans, Order of Friars Preachers
About Ceslaus
Blessed Ceslaus (c. 1184 – c. 1242)
Blessed Ceslaus, also known by his Polish name Czesław, was a prominent figure in the early Dominican Order, born into the noble Odrowąż family in Kamień Śląski, Silesia, Poland. After pursuing studies in philosophy in Prague and theology and law in Bologna, he entered religious life. He joined the Order of Friars Preachers in 1220, receiving the habit from Saint Dominic of Guzmán, and was among the first to study at the Dominican studium in Rome.
Life and Ministry
Ceslaus embarked on extensive missionary work throughout Bohemia, Poland, Pomerania, and Saxony, establishing priories and spreading the Dominican charism. He was instrumental in the Order's expansion in his native land and was eventually appointed Provincial Superior for Poland. A significant event in his life, according to tradition, occurred during the Mongol invasion of Poland, when the city of Wrocław was besieged. Ceslaus is credited with miraculously averting the impending disaster through his fervent prayers.
Veneration
He died around 1242 in Wrocław, where his tomb is preserved in the Church of St. Adalbert. Ceslaus has been venerated as a blessed figure for centuries, with his cult officially confirmed by Pope Clement XI in 1713. His feast day is celebrated on July 16th throughout the Dominican Order.
Source: Wikipedia ↗
Frequently Asked Questions
Who was Blessed Ceslaus?
Blessed Ceslaus was a Polish nobleman and a Dominican friar who lived in the 13th century. He is recognized for his extensive missionary work across Bohemia, Poland, Pomerania, and Saxony, and for his role as Provincial Superior for Poland.
When and where was Ceslaus born?
Ceslaus was born around 1184 in Kamień Śląski, located in Silesia, Poland. He belonged to the noble Odrowąż family.
What was Ceslaus's religious life like?
Ceslaus joined the Order of Friars Preachers in 1220, receiving the habit from Saint Dominic of Guzmán himself. He studied at the Dominican studium in Rome and later became a missionary, eventually serving as Provincial Superior for Poland.
What is Ceslaus known for during the Mongol invasion?
During the Mongol threat to Poland, the city of Wrocław sought Ceslaus's aid. It is recorded that through his prayers, he miraculously averted the impending calamity from the city.
When was Ceslaus's cult confirmed?
Ceslaus had always been venerated as a blessed figure. His cult was officially confirmed by Pope Clement XI in 1713.
Where are Ceslaus's relics located?
The tomb of Blessed Ceslaus is located in the Church of St. Adalbert in Wrocław, Poland.
Related Blesseds

Augustine Fangi
Augustine Fangi was an Italian Dominican friar and Catholic priest known for his piety and perceived miracle-working abilities. He served as prior in several Dominican monasteries, focusing on upholding the Rule of Saint Dominic. Fangi was beatified in 1878.
Gundisalvus of Amarante
Gundisalvus of Amarante was a Portuguese Catholic priest and hermit of the Order of Preachers. Known for his extensive pilgrimages and dedication to serving his local community, he was beatified by Pope Pius IV in 1561. His life is marked by legendary miracles, including providing wine and fish to workers.
Jan Beyzym
Jan Beyzym was a Jesuit priest from Poland who dedicated his life to serving lepers in Madagascar. He is recognized for his tireless efforts in caring for the sick and establishing a leper hospital. He was beatified by Pope John Paul II in 2002.