A duke is a leader. 
A duke is a leader. 
Long ago, dukes were military leaders. They led soldiers in many lands.
Some dukes ruled over a place. This land is called a duchy.
A woman with this title is a duchess. This title is still used today.
Some dukes are part of royal families. They are very important people.
A duke is a high-ranking leader. The word comes from a Latin word. That word means "leader." 
Long ago, a duke was a military leader. In Rome, they led soldiers in provinces. Later, dukes became rulers of large lands. This land is called a duchy.
In the Middle Ages, dukes were very powerful. In some lands, they were the top officials. They were even higher than counts. In England, King Edward III made many dukes. He gave titles to his sons. One was the Duke of Cornwall. This title is still used today for the king's eldest son. Another is the Duke of Lancaster. The king holds this title too.
Today, very few dukes rule as monarchs. Most dukes are part of noble families. A woman with this title is a duchess. In Sweden, royal children get a dukedom at birth. The title remains a very important rank in many places.
A duke is a very high-ranking person in a royal or noble family. The title can belong to a ruler of a specific land. This land is called a duchy or a dukedom. 
This title has a long history that began in ancient Rome. The word comes from the Latin word "dux," which means "leader." In the Roman Republic, a dux was a military commander without a formal rank. Later, the title meant the leader of a province's military. After the emperor Diocletian made reforms, the dux became the military commander for each province. In the Eastern Roman Empire, the title became "doux." This rank was like a captain or a general. By the 11th century, a new title called "Megas Doux" was used for the navy's commander-in-chief.
During the Middle Ages, dukes were very powerful leaders in Europe. In Germanic kingdoms, the title often meant the first among many rulers. Dukes ruled over provinces and were higher than counts in the cities. In the Frankish lands, dukes were the highest officials in the realm. They even met with the king every May to discuss new policies. The Lombards in Italy also had dukes who were very independent. Some dukes even ruled for ten years without a king at all.
In England, the title changed many times over the years. Before the Normans arrived, high-ranking leaders were called ealdormen. King Edward III helped create many English dukedoms in the 1300s. He named his son, the Black Prince, as the Duke of Cornwall in 1337. He also created the title Duke of Lancaster in 1351. By the year 1483, there were 16 different ducal titles in England. Some of these titles, like Norfolk, are still held by families today.
Today, the way we use the title is quite different. In the 19th century, many small states in Germany and Italy were ruled by dukes. Now, almost no dukes rule as monarchs, except for the Grand Duke of Luxembourg. In the United Kingdom, dukes are part of the peerage but do not rule independent lands. The Duke of Cornwall is a special case because it provides income for the heir to the throne. In Sweden, members of the royal family receive a personal dukedom when they are born. Even the Pope has occasionally given the title to people for their service.
A duke is a high-ranking title within royalty or nobility. This title can belong to a monarch who rules over a specific territory. This territory is known as a duchy or a dukedom. 
The history of the title begins with the Latin word "dux," which means "leader." In the Roman Republic, a dux was a military commander without an official rank. Later, the term described the leading military commander of a province. Following reforms by the emperor Diocletian, the dux became the specific military commander for each Roman province. In the Eastern Roman Empire, the term became "doux," representing a rank similar to a captain or general. By the 11th century, the title "Megas Doux" was introduced for the commander-in-chief of the entire navy.
During the Middle Ages, the role of the duke changed across different European cultures. In Germanic monarchies, the title often signified the first among many rulers. These dukes ruled provinces and acted as superiors to the counts who managed cities. In the Frankish kingdoms, dukes were the highest-ranking officials. They often led military expeditions and met with the king every May to discuss policy. In Italy, the Lombards used the title "duces" for their war leaders. These leaders became highly independent provincial rulers. In fact, between 575 and 585, a period called the Rule of the Dukes occurred when dukes governed without a king.
In England, the title evolved significantly over several centuries. During Anglo-Saxon times, the highest rank below a king was the ealdorman. Eventually, this title was replaced by the Danish term "eorl," which became "earl." After the Norman conquest, the power of dukes was more limited to the jurisdiction of Norman counts. It was not until 1337 that King Edward III created the first English dukedom. He named his eldest son, the Black Prince, as the Duke of Cornwall. By 1483, a total of 16 different ducal titles had been created in England, including York, Lancaster, and Clarence.
The relationship between a title and land can be complex. A duchy is the geopolitical entity or territory ruled by a duke. In the United Kingdom, most dukes are members of the peerage but do not rule independent lands. However, some exceptions exist, such as the Duke of Cornwall. This title includes both a dukedom and an estate known as a duchy. The income from these estate holdings supports the heir to the British throne. Similarly, the British monarch holds the title Duke of Lancaster. This provides the sovereign's Privy Purse through the income from the duchy estates.
There are also unique connections between modern titles and historical lands. The Channel Islands are considered the last vestiges of the lands of the Duchy of Normandy. While the islands have autonomy, the people still recognize the King as their Duke. In Sweden, the tradition is different because members of the royal family are given a personal dukedom at birth. Even the Pope has occasionally granted the title of duke or duchess. This is usually done to recognize people for their services to the Holy See.
Today, the era of dukes ruling as independent monarchs has mostly ended. In the 19th century, many small states in Germany and Italy were still ruled by dukes or grand dukes. Since the unification of Italy in 1870 and the end of German and Austrian monarchies in 1918, reigning dukes are rare. The Grand Duchy of Luxembourg is the only remaining state ruled by a grand duke. In other places like Spain and the United Kingdom, the title remains the highest hereditary rank outside of the reigning royal family.
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