Monaco is the smallest country to have won what?
The first Eurovision Song Contest took place in Lugano, Switzerland, in 1956, and has since grown into a hugely popular annual event. Each European country, plus Israel and Australia, puts forth a musical act and viewers vote on their favorite. Monaco first entered Eurovision in 1959, placing last. The country won the contest in 1971, making it the smallest country to have done so.
Source: Eurovision Song Contest