Gibraltar-Vatican Joint Issue
The Vatican City State issued its first stamps in 1929, the same year that it was established under the Lateran Treaties. It released its first joint issue in 1969. Joint issues of stamps by the Vatican and other countries were uncommon for most of the twentieth century. In 2000, the Vatican and Poland released a joint issue designed by Czeslaw Slania which commemorated the eightieth birthday of John Paul II. However, the early twenty-first century saw a substantial increase in joint issues. In 2003, a set released by the Vatican and Poland celebrated the twenty-fifth anniversary of John Paul II's pontificate. The following year, a joint issue of the same countries commemorated the pope's return visits to Poland. In 2005, five of the eleven stamp sets released by the Vatican were joint issues. There have also been joint issues with Germany since Benedict XVI became Pope. In 2011, the Vatican and Croatia released a joint issue which commemorated the tercentenary of the birth of Rugerius Boscovich (1711 – 1787).
Monarchies in Europe
Differently from the Holy See, in existence for almost two thousand years, the Vatican City was not a sovereign state until the 20th century. In the 19th century the annexation of the Papal States by the Kingdom of Sardinia, and the subsequent establishment of the Kingdom of Italy, was not recognized by the Vatican. However, by the Lateran treaty of 1929, the Kingdom of Italy recognized Vatican City as an independent state, and "vice versa". Since then, the elected monarch of the Vatican City state has been the current pope. The pope still officially carries the title "King of the Ecclesiastical State" (in Latin: Rex Status Ecclesiæ).