Cethech an Irish saint, bishop of Cill-garadh, is commemorated June 16. He is usually known as St. Patrick's bishop. His father belonged to Meath, and his mother was of the race of Olildus or Tirellil. He was born at Donnagh Sarige, near Duleek and when St. Patrick was going westward through Roscommon, he gave the church of Cill-garadh to St. Cethech, who was buried there at the end of the 5th century. He had many churches under his charge (Colgan, Tr. Thaum. p. 135, 136, 176, 267).