Blessed Ceslaus was the son of a noble Silesian family and possibly St. Hyacinth's brother. Hee was ordained, became a canon in Cracow, Poland, a provost at St. Mary's in Sandomir, went to Rome, and was received into the Dominicans by St. Dominic. Blessed Ceslaus preached in Poland, Silesia, Pomerania, and Bohemia, was spiritual adviser to St. Hedwig, was elected provincial of the Polish province, and became prior of a priory at Breslau. His prayers were credited for the defeat of Tartans attacking Breslau in Silesia during their invasion of 1240. His cult was confirmed in 1713. His feast day is July 17.
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