Answer: Casimir Jagiellon (1458 – 1484) was a prince of the Kingdom of Poland and of the Grand Duchy of Lithuania. He was the second son of King Casimir IV Jagiellon. After his elder brother Vladislaus was elected as King of Bohemia in 1471, Casimir became the heir apparent. At the age of 13, Casimir participated in the failed military campaign to install him as King of Hungary.

St Casimir became known for his piety, devotion to God, and generosity towards the sick and poor. It may be hard for us to imagine royal luxury as a pressure. But for Casimir, the riches around him were temptations to forget his true loyalties. Rebelling against the rich, fashionable clothes he was expected to enjoy, he wore the plainest of clothes. Rejecting even ordinary comforts, he slept little, spending his nights in prayer. And when he did sleep, he lay on the floor not on a royal bed. Even though he was a prince, many of those around him must have laughed and joked at his choices. Yet, in the face of any pressure, Casimir was always friendly and calm. He became ill (most likely with tuberculosis) and died at the age of 25.

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St Casimir
5th Century of Birth
264-265 (1959)

St Casimir
5th Century of Death
731-732 (1984)