Wikipedia
The Syllabus of Errors was a document issued by Holy See under Pope Pius IX on December 8, 1864, Feast of the Immaculate Conception, on the same day as the Pope's encyclical Quanta cura. It listed the church's position in a number of both philosophical and political areas, and referred to the church's teaching on these matters as given in a number of documents issued previously. It is important as it was widely interpreted as an attack by the church on modernism, secularization and the political emancipation of Europe from the tradition of Catholic Monarchies.
Usage examples of "syllabus of errors".
The high-water mark in recent history is the 1864 Syllabus of Errors of Pius IX, the pope who also convened the Vatican Council at which the doctrine of papal infallibility was, at his insistence, first proclaimed.