 There were at Hamar a cathedral chapter with ten canons, a school, a Dominican Priory of St. Olaf, and a monastery of the Canons Regular of St. Anthony of Vienne.Hamar, like most of Norway, was severely diminished by the Black Plague in 1349, and by all accounts continued this decline until the Reformation, after which it disappeared.The Reformation in Norway took less than 10 years to complete, from 1526 to 1536.