St. Casimir of Poland (1458-1484) was the second son of King Casimir IV and Queen Elizabeth of Austria, one of thirteen children born to them in the royal palace at Cracow. Casimir committed his life to God from an early age, thanks in part to a brilliant and pious priest who served as the royal tutor. He turned away from the privileges of his station in life and instead exercised extreme asceticism and self-denial. He wore a hairshirt under his clothes, slept on the cold ground, and knelt in prayer for long hours outside of locked churches. At the age of thirteen the Hungarians requested Prince Casimir to rule their country as king, which he accepted in the hope of defending the Christian nation against the Turks. However, the plan did not come to fruition and he returned home to continue his life of prayer, penance, and generosity to the poor. He later ruled Poland for a few short years while his father attended royal business in Lithuania. Casimir took a vow of celibacy which he upheld despite immense political pressure to marry. He suffered from a chronic lung condition, which he succumbed to in 1484 at the age of 25. Many miracles were attributed to his intercession after his death. St. Casimir is the patron saint of Poland, Lithuania, and young people. His feast day is March 4th.