AD meaning in Country Names ?

Andorra, officially the Principality of Andorra, is a sovereign landlocked microstate on the Iberian Peninsula, in the eastern Pyrenees, bordered by France to the north and Spain to the south. Believed to have been created by Charlemagne, Andorra was ruled by the count of Urgell until 988, when it was transferred to the Roman Catholic Diocese of Urgell. The present principality was formed by a charter in 1278. It is headed by two co-princes: the Bishop of Urgell in Catalonia, Spain and the President of France. Its capital and also its largest city is Andorra la Vella.

Andorra is the sixth-smallest state in Europe, having an area of 468 square kilometres (181 sq mi) and a population of approximately 77,006. The Andorran people are a Romance ethnic group of originally Catalan descent. Andorra is the 16th-smallest country in the world by land and the 11th-smallest by population. Its capital, Andorra la Vella, is the highest capital city in Europe, at an elevation of 1,023 metres (3,356 feet) above sea level. The official language is Catalan, but Spanish, Portuguese, and French are also commonly spoken.

Tourism in Andorra sees an estimated 10.2 million visitors annually. Andorra is not a member state of the European Union, but the euro is its official currency. It has been a member of the United Nations since 1993. In 2013, Andorra had the highest life expectancy in the world at 81 years, according to the Global Burden of Disease Study.