A Massive Vatican Flag from the Early 20th Century

The flag of Vatican City was adopted on 7 June 1929, the year Pope Pius XI signed the Lateran Treaty with Italy, creating a new independent state governed by the Holy See. The Vatican City flag is modeled on the 1808 yellow and white flag of the earlier Papal States, to which a papal tiara and keys were later added. The Vatican (and the Holy See) also refers to it, interchangeably, as the flag of the Holy See.

This particular flag measures 200 X 260 cm.

The flag consists of two vertical bands, one of gold or yellow (hoist side) and one of white with the crossed keys of Saint Peter and the Papal Tiara centered in the white band. The crossed keys consist of a golden and a silver key, in which the silver key is placed in the dexter position.

Despite the widespread idea that the flag is square, its proportions are not specified in the constitution.

The coat of arms of Vatican City is present in the white half.