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Welcome to The Inquiry from the BBC World Service.
I'm Charmaine Cozier.
Each week, one question, four expert witnesses and an answer.
1881, Bulgaria.
A brand new currency goes into circulation in the southeastern European country.
It's called the Lev, from an old Bulgarian word for lion, a national symbol of strength and independence.
The Lev prevailed through the Balkan Wars of 1912 and 1913 and two world wars that followed.
In the 1990s, a severe financial crisis saw the currency devalue and inflation soar.