His Feast Day is May 10.
St. Cataldo is an intercessor before the Lord for persons with visual impairments, epilepsy, and paralysis.
He was a Bishop. He established a monastery in Ireland, visited the Holy Land, and was shipwrecked in southern Italy where he labored to enlighten the peoples who had reverted to paganism there.
Here are three websites offering accounts of him; the last one seems to have confused the year he died with the year he was canonized (declared a Saint).