I'd be interested in saints who were Jєωιѕн converts prior to WWII.
Here's another, 2Vermont:
St Epiphanius of Salamis, Doctor of the Church
12 May
Born in 315 of Israelite parents, near Eleutheropolis, in Palestine. He began to study Holy Scripture and with his sister received Baptism; then leaving part of his inheritance to her, he sold his property, gave the money to poor, only keeping what he needed to buy books for his studies.
With a desire for perfection, he was formed for monastic life by the solitaries of Egypt. He returned to Palestine, was ordained priest and founded a monastery in Eleutheropolis of which he was abbot for 30 years. His labor to grow in virtue seemed to surpass his strength; but always his answer was: “God gives the kingdom of heaven only on condition that we labor; and all we can do bears no proportion to such a crown.” He would relax his austerities for hospitality’s sake, favoring charity over abstinence. To all this he added tireless application to study. He was shocked in reading the many errors of Origen, and began early in his life to caution the faithful against them. Epiphanius benefitted by St Hilarion of Palestine’s spiritual direction for over 20 years.
A prophecy made to him in Egypt, that one day he would be bishop in Cyprus, alarmed him; and so he decided to go elsewhere. But his ship was blown off course to Cyprus, where the bishops were assembled to choose a new bishop of Salamis, and by providence Epiphanius was elected. He continued to wear the monastic habit, visiting his Palestine monastery from time to time.
In the Arian persecution in the reign of Constantius, St Epiphanius often left his cell to comfort and encourage the Faithful. The veneration which all men had for his sanctity, exempted him from the persecution of the Arian emperor Valens; being almost the only Catholic bishop in that part of the empire who was spared.
He was the oracle of Palestine and the neighboring countries; no one ever visited St Epiphanius who did not receive great spiritual comfort by his holy advice.
He journeyed to Antioch to try to convert Vitalis the Apollinarist bishop; and he attended a council convoked at Rome by Pope St Damasus. He was a friend of St Jerome, addressing him as "most loving lord, son, and brother, the presbyter Jerome". He was an authority on Marian devotions, and his writings include a Bible dictionary, and The Medicine Box, a huge work which catalogued and refuted 80 heresies of his day.
In 403, he was taken ill and died during the voyage from Constantinople back to Salamis, having been bishop 36 years. God honored his tomb with miracles.