Information: - Marshal (also spelled marshall) is a term used in several official titles in various branches of society. As marshals became trusted members of the courts of Medieval Europe, the title grew in reputation. During the last few centuries, it has been used for elevated offices, such as in military rank and civilian law enforcement. - A castle (from ) is a type of fortified structure built in Europe and the Middle East during the Middle Ages by nobility. Scholars debate the scope of the word "castle", but usually consider it to be the private fortified residence of a lord or noble. This is distinct from a palace, which is not fortified; from a fortress, which was not always a residence for nobility; and from a fortified settlement, which was a public defence though there are many similarities among these types of construction. Usage of the term has varied over time and has been applied to structures as diverse as hill forts and country houses. Over the approximately 900years that castles were built, they took on a great many forms with many different features, although some, such as curtain walls and arrowslits, were commonplace. - Colonel (abbreviated Col., Col or COL and pronounced , similar to "kernel") is a senior military officer rank below the general officer ranks. However, in some small military forces, such as those of Iceland or the Vatican, colonel is the highest rank. It is also used in some police forces and paramilitary organizations. - Sargento mayor ("sergeant major") was a rank immediately below that of "maestro de campo" in the Spanish "tercio"s of the 16th and 17th centuries. Initially second in rank to a "coronel" ("colonel") in a "colunella", the "sargento mayor" became second in rank to the "maestre de campo" after the creation of the "tercio"s in 1534. He took care of the tactical training, security and lodging of the troops of the "tercio". Also he transmitted the orders of the "maestre de campo" or the "capitan general" to subordinate officers. - Habsburg Spain refers to the history of Spain over the 16th and 17th centuries (15161700), when it was ruled by kings from the House of Habsburg (also associated with its role in the history of Central Europe). The Habsburg rulers (chiefly Charles I and Philip II) reached the zenith of their influence and power. They controlled territory that included the Americas, the East Indies, the Low Countries and territories now in France and Germany in Europe, the Portuguese Empire from 1580 to 1640, and various other territories such as small enclaves like Ceuta and Oran in North Africa. This period of Spanish history has also been referred to as the "Age of Expansion". - Spain, officially the Kingdom of Spain, is a sovereign state largely located on the Iberian Peninsula in southwestern Europe, with two large archipelagos, the Balearic Islands in the Mediterranean Sea and the Canary Islands off the North African Atlantic coast, two cities Ceuta and Melilla in the North African mainland and several small islands in the Alboran Sea near the Moroccan coast. Its mainland is bordered to the south and east by the Mediterranean Sea except for a small land boundary with Gibraltar; to the north and northeast by France, Andorra, and the Bay of Biscay; and to the west and northwest by Portugal and the Atlantic Ocean. It is the only European country to have a border with an African country (Morocco) and its African territory accounts for nearly 5% of its population, mostly in the Canary Islands but also in Ceuta and Melilla. - The Kingdom of Castile was a large and powerful state on the Iberian Peninsula during the Middle Ages. Its name comes from the host of castles constructed in the region. It began as the County of Castile ("Condado de Castilla"), an eastern frontier lordship of the Kingdom of Leon in the 9th century. During the 10th century its counts increased their autonomy, but it was not until 1065 that it was separated from Leon and became a kingdom in its own right. Between 1072 and 1157 it was again united with Leon, and after 1230 this union became permanent. Throughout this period the Castilian kings made extensive conquests in the southern Iberia at the expense of the Islamic principalities. Castile and Leon, with their southern acquisitions, came to be known collectively as the Crown of Castile, a term that also came to encompass overseas expansion. - Infantry is the general branch of an army that engages in military combat on foot. As the troops who engage with the enemy in close-ranged combat, infantry units bear the largest brunt of warfare and typically suffer the greatest number of casualties during a military campaign. Historically, as the oldest branch of the combat arms, the infantry are the tip of the spear of a modern army, and continually undergo training that is typically more physically demanding and psychologically stressful than that of any other branch of the combat arms. Common representations of infantry fighting forces include the U.S. Army Infantry Branch, U.S. Marine Corps Infantry, Royal Canadian Infantry Corps, Infantry of the British Army, and the Royal Australian Corps of Infantry. - The Crown of Castile was a medieval state in the Iberian Peninsula that formed in 1230 as a result of the third and definitive union of the crowns and, some decades later, the parliaments of the kingdoms of Castile and Leon upon the accession of the then Castilian king, Ferdinand III, to the vacant Leonese throne. It continued to exist as a separate entity after the personal union in 1469 of the crowns of Castile and Aragon with the marriage of the Catholic Monarchs up to the promulgation of the Nueva Planta decrees by Philip V in 1715. - The Kingdom of Leon (Leonese: "Reinu de Llion", , , ) was an independent kingdom situated in the northwest region of the Iberian Peninsula. It was founded in AD 910 when the Christian princes of Asturias along the northern coast of the peninsula shifted their capital from Oviedo to the city of Leon. The County of Portugal separated to become the independent Kingdom of Portugal in 1139 and the eastern, inland part of Leon was joined to the Kingdom of Castile in 1230. - The Iberian Peninsula , also known as Iberia, is located in the southwest corner of Europe. The peninsula is principally divided between Portugal and Spain, comprising most of their territory. It also includes Andorra and a small part of France along the peninsula's northeastern edge, as well as Gibraltar on its south coast, a small peninsula which forms an overseas territory of the United Kingdom. With an area of approximately , it is the second largest European peninsula, after the Scandinavian. - Maestre de campo was a rank created in 1534 by the Emperor Carlos V , inferior in rank only to the capitan general and acted as a chief of staff . He was chosen by the monarch in the Council of State , and commanded a tercio . Their powers were similar to those of the old marshals of the Kingdom of Castile : he had the power to administer justice and to regulate the food supply . His personal guard consisted of eight German halberdiers , paid by the king , who accompanied him everywhere . Immediately inferior in the chain of command was the sargento mayor . One of the most famous maestre de campo was Julian Romero , a common soldier who reached the rank of maestre de campo and that brought victory to the Spanish tercios in the battles of San Quintin and Gravelines . In the overseas colonies of the Spanish Empire a governor held the rank of capitan general over his local forces and would appoint his maestre de campo . - Sergeant major is a senior non-commissioned rank or appointment in many militaries around the world. In Commonwealth countries, the various degrees of sergeant major are appointments held by warrant officers. In the United States, there are also various grades of sergeant major (command sergeant major, Sergeant Major of the Army, Sergeant Major of the Marine Corps), but they are all of the same pay grade of E9. (However, the Sergeant Major of the Army and the Sergeant Major of the Marine Corps, as their respective service's Senior Enlisted Advisor, receive a special rate of basic pay that is higher than all other sergeants major.) - A tercio ("third") or tercio espanol ("Spanish third") was a Spanish infantry organization during the time that Habsburg Spain dominated Europe in the Early Modern era. - In the history of Europe, the Middle Ages or medieval period lasted from the 5th to the 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance and the Age of Discovery. The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity, the medieval period, and the modern period. The medieval period is itself subdivided into the Early, High, and Late Middle Ages. What entity does 'maestre de campo' has the relation 'instance of' with?
A:
military rank