 Despite problems over the number and quality of clergy after the Black Death in the fourteenth century, and some evidence of heresy in this period, the church in Scotland remained relatively stable before the Reformation in the sixteenth century.That remained the case until the Scottish Reformation in the mid-16th century, when the Church in Scotland broke with the papacy and adopted a Calvinist confession in 1560.At that point, the celebration of the Catholic mass was outlawed.