Leopold-I was Holy Roman Emperor reigning from 1658 to 1705 AD. During his lengthy reign, Austria emerged from a series of struggles with the Turks and the French to become a great European power.
He was the second son of the emperor Ferdinand III and his first wife Maria Anna of Spain. When Leopold was fourteen he became heir to the throne after the sudden death of his elder brother. Leopold's reign is known for conflicts with the Ottoman Empire in the east and rivalry with Louis XIV, a contemporary and first cousin, in the west.
Depicted here is a 3 Kreuzer issued under his reign. The obverse of a coin depicts Leopold I facing right. Legend around "Leopold, by God Grace, Emperor of the Romans always august, King of Germany, Hungary, and Bohemia". The reverse of a coin engraved Doubled headed imperial eagle under a crown with a flat top shield (CA) or oval shield (flower min mark) with arms of Austria and Burgundy. The date above separated by the crown.
Image Source: https://en.wikipedia.org/