In June 1446, one day after William's marriage with the Habsburg princess Anne of Austria, the split led to a war between the two brothers known as the Saxon Fratricidal War ("Sächsischer Bruderkrieg"). The brothers continued fighting until peace was reached in a meeting at Naumburg on 27 January 1451. Later, in the 1459 Treaty of Eger, Elector Frederick II, his brother Duke William III, and King George of Poděbrady fixed the borders between the Kingdom of Bohemia and the Saxon electorate. This border along the crest of the Ore Mountains is still current and is one of the oldest existing borders in Central Europe.