Kreuzerhöhung
The term was originally used to indicate the eight days of celebration for the dedication of the Church of the Holy Sepulchre in Jerusalem, which celebration covered also to the discovering of the True Cross by Empress Helena in 326. Because the Church of the Holy Sepulchre was consecrated on September 13, 335, the Encaenia started on September 13, while the cross itself was brought outside the church on September 14 so that the clergy and faithful could pray before the True Cross (Feast of the Cross).