The father and son made their religious profession together. The humility, obedience, mildness, and devotion, together with the admirable purity of manners, which shone forth in every action of St. Omer, distinguished him among his saintly brethren, and he was soon called from his solitude to take charge of the government of the Church in Terouenne. The greater part of those living in his diocese were still pagans, and even the few Christians were, through a scarcity of priests, fallen into a sad corruption of manners The great and difficult work of their conversion was reserved for St. Omer. The holy bishop applied himself to his task with such zeal that in a short time his diocese became one of the most flourishing in France. In his old age St. Omer became blind, but that affliction did not lessen his pastoral concern for his flock. He died in the odor of sanctity, while on a pastoral visit to Wavre, in 670.
Feast Day of Saint Omer
The Feast Day of Saint Omer is September 9. The origin of Feast Days: most saints have specially designated feast days and are associated with a specific day of the year and these are referred to as the saint's feast day.
The feast days first arose from the very early Christian custom of the annual commemoration of martyrs on the dates of their deaths at the same time celebrating their birth into heaven.