The Bachal Isu (from Latin baculus Iesu, "Staff of Jesus") was a Christian relic. According to legend, St. Patrick brought his celebrated golden Crozier, which was consistently identified with the Staff Of Jesus, along with his Book of Gospels, known as the Book of Armagh, to Armagh Cathedral in Ulster which he had recently founded.
According to tradition, the staff was given to St. Patrick by a hermit on an island located in the Etruscan Sea, who had received it from Jesus Christ. Jesus informed the hermit to give it to St. Patrick when he inevitably arrived.