The Bachal Isu (or "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 The Gospels, to the Armagh Cathedral in Northern Ireland 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.
Read more about Bachal Isu: Legend of St. Malachy, Destruction of The Staff, Beliefs Related To The Staff