A native of Silesia, which belonged to Poland, he received the degrees of doctor of laws and divinity after study at Cracow, Prague, and Bologna.  Back in Silesia, he was employed in the administration of the diocese.  When Yvo, his uncle, was appointed Bishop, he took Hyacinth and Celas, his nephews with him to Cracow.  Hyacinth joined St. Dominic, along with Celas and two German gentlemen, and he received the habit from St. Dominic.  After a novitiate of only six months, they made their vows by special dispensation.  They returned to Poland, and Hyacinth was appointed superior of their mission.  They received many new members to their order on the way home.  The morals of the city of Cracow were entirely affected by the preaching of Hyacinth.  He traveled to Prussia, Pomerania and many other northern countries preaching and converting many along the way.  He visited some of the convents he had founded over the years even going to China and Tibet.  In 1257 he was back in Cracow at age 72 and died on August 15.  He was known for his numerous miracles.  He was known as one of the greatest travelers of his day.

FEAST DAY:  August 17