Jewish families owned two houses in the town. Isak von Lienz was the private banker of the Counts of Goerz, and the most prominent Jewish banker of the East-Alpine region at the beginning of the 14th century. He was a moneylender and a leaseholder of mint and toll.
In 1443 the Jews were accused of the murder of the little girl Ursula Poeck who was found dead in a river. Two male Jews were hanged together with a dog, symbolizing their despised status, and two Jewish women burned at the stake. Five children were spared death and were baptized. In 1472 a Jew, who came to Lienz disguised by a Christian name, was expelled from the town.