From Catholic Culture:

“St. Blaise enjoyed widespread veneration in the Eastern and Western   Churches due to many cures attributed to him. According to tradition, he was Bishop of Sebaste in Armenia and was martyred under Licinius. On this day the Church gives a “Blessing of the Throats” in honor of St. Blaise. From the eighth century he has been invoked on behalf of the sick, especially those afflicted with illnesses of the throat.

St. Ansgar became known as the “Apostle of the North” for his great evangelical work in Denmark and Sweden. He was Bishop of Hamburg and then of Bremen. Gregory IV appointed him as his delegate to Denmark and Sweden.”

Read more about St. Blaise and St. Ansgar here.