Since the first duke of England was the Duke of Cornwall, the son of Edward III, 1337, I'm going to assume that the first Duchy would be the same, Duchy of Cornwall.
The Duchy of Lancaster is held by the Soverign. in Lancaster the toast, "To the Queen, Duke of Lancaster" that's "Duke" not Duchess.
Duchy of Savoy ended in 1713.
A duchy is the jurisdiction of a Duke. You'd have to check out the specific duchy for more detailed information. A good place to start is the British Royalty website.
United Baltic Duchy ended in 1918.
Richard the Lionheart, also known as Richard I of England, ruled over a vast empire that included England, parts of France, and territories in the Crusader states. His lands primarily consisted of the Duchy of Normandy, the County of Anjou, the Duchy of Aquitaine, and other regions in France. Additionally, he held the title of King of England, which included the English territories and associated lands. His reign was marked by his involvement in the Third Crusade and his efforts to reclaim Jerusalem.
The French surname of Dubuque is first found in early records of Normandy, the former Duchy of Normandy.
You are clearly very confused. England has never been a Duchy (a territory ruled by a Duke).
No - he was the Duke of Normandy. The Duchy of Normandy is in the north west of France, the closest part to England.
A duchy
Duchy of Urbino ended in 1625.
Duchy of Urbino was created in 1443.
Duchy of Carniola ended in 1918.
Duchy of Carniola was created in 1364.
Duchy of Friuli ended in 828.
Duchy of Friuli was created in 569.
Duchy of Florence was created in 1532.
Duchy of Florence ended in 1569.
Duchy of Württemberg ended in 1806.