Acta Sanctae Sedis was a Roman monthly publication containing the principal public documents issued by the Pope, directly or through the Roman Congregations.

It was begun in 1865, under the title of "Acta Sanctæ Sedis in compendium redacta etc.", and on 23 May 1904 was declared an organ of the Holy See to the extent that all documents printed in it were considered "authentic and official".

It continued to exist for four more years, until by the decree Promulgandi Pontificias Constitutiones (29 September 1908) Pope Pius X

Pope Pius X

Pope Saint Pius X , born Giuseppe Melchiorre Sarto, was the 257th Pope of the Catholic Church, serving from 1903 to 1914. He was the first pope since Pope Pius V to be canonized. Pius X rejected modernist interpretations of Catholic doctrine, promoting traditional devotional practices and orthodox...

 replaced it with the Acta Apostolicae Sedis

Acta Apostolicae Sedis

Acta Apostolicae Sedis , often cited as AAS, is the official gazette of the Holy See, appearing about twelve times a year. It was established by Pope Pius X with the decree Promulgandi Pontificias Constitutiones , and publication began in January 1909...

, to which he gave the status of the official gazette

Gazette

A gazette is a public journal, a newspaper of record, or simply a newspaper.In English- and French-speaking countries, newspaper publishers have applied the name Gazette since the 17th century; today, numerous weekly and daily newspapers bear the name The Gazette.Gazette is a loanword from the...

 of the Holy See

Holy See

The Holy See is the episcopal jurisdiction of the Catholic Church in Rome, in which its Bishop is commonly known as the Pope. It is the preeminent episcopal see of the Catholic Church, forming the central government of the Church. As such, diplomatically, and in other spheres the Holy See acts and...

, and which began publication in January 1909.