Duchy (noun)

1. A territory ruled by a duke or duchess.
2. A sovereign state.

Origin:

Middle english: from old french ducie, from duc (see duke).

Examples:

1. The Grand Duchy of Luxembourg is a small, landlocked country in Western Europe.
2. The Duchy of Brittany was a powerful state in medieval France.
3. The Duchy of Savoy was one of the many Italian states that were absorbed into the kingdom of Sardinia in the 19th century.
4. The Duchy of Burgundy was one of the largest and most powerful states in Europe during the 15th and 16th centuries.
5. The Duchy of Milan was a major center of Renaissance culture and commerce, attracting artists, writers, and merchants from all over Europe.