The basis for the commemorative coins derived from a decision of the European Council, which repealed the prohibition of changing the national obverse sides of euro coins from 1 January 2004 onwards.
The face value of the coins, typically is less than their intrinsic value of between €3 and €12. The exceptions are San Marino and the Vatican City, where coins from the former are regularly sold for between €30 and €40, while coins from the latter are very rarely obtained for less than €100. Issued designs are made public in the Official Journal of the European Union.
Sofia is the capital and largest city of the Republic of Bulgaria, with a population of 1,246,791, and some 1,377,761 in the metropolitan area, the Capital Municipality. It is located in western Bulgaria, at the foot of the mountain massif Vitosha, and is the administrative, cultural, and economic centre of the country.