In the 17th century Salzburg’s Archbishops drew out every Protestant believer; often they had to leave their children behind, who were brought up by Catholics then - imagine!
in 1956 their successor on the Salzburg seat wrote to the Lutherans to ask their forgiveness and they thanked for his letter;
now 50 years later, in 2016, the Lutheran bishop of Austria accepted the bid! He took part in the journey by the way, as did high officials of the Catholics.
Source: Personal (unofficial) report on the Reformation Commemoration Tour of Austria, August 16-26, 2016