Regent in the context of "Brunhilda of Austrasia"

Antipater (/ænˈtɪpətər/; Ancient Greek: Ἀντίπατρος, romanized: Antipatros, lit. 'like the father'; c. 400 BC – 319 BC) was a Macedonian general, regent and statesman under the successive kingships of Philip II of Macedon and his son, Alexander the Great. In the wake of the collapse of the Argead house, his son Cassander eventually ruled Macedonia as a king in his own right.

Probably active during the reign of Perdiccas III of Macedon, most of Antipater's political career was as one of Philip II's foremost Hetairoi. After Philip II's death, he helped Alexander secure the throne. When Alexander began his wars against the Persian Empire in 336 BC, Antipater remained behind to hold Macedon and Greece as regent. While Alexander was campaigning, Antipater crushed revolts, like that of King Agis III of Sparta, and managed Greek affairs. After the Death of Alexander the Great in 323 BC, Antipater was reconfirmed in his position as viceroy of Europe in the Partition of Babylon.

A monarch (/ˈmɒnərk/) is a head of state for life or until abdication, and therefore the head of state of a monarchy. A monarch usually exercises the highest authority and power in the state. Usually, a monarch either personally inherits the lawful right to exercise the state's sovereign rights (often referred to as the throne or the crown) or is selected by an established process from a family or cohort eligible to provide the nation's monarch. Alternatively, an individual may proclaim oneself monarch, or even usurp power, as many Ancient Greek tyrants did. If a young child is crowned the monarch, then a regent is often appointed to govern until the monarch reaches the requisite adult age to rule.

The Kamakura shogunate (Japanese: 鎌倉幕府, Hepburn: Kamakura bakufu) was the feudal military government of Japan during the Kamakura period from 1185 to 1333.

The Kamakura shogunate was established by Minamoto no Yoritomo after victory in the Genpei War and appointing himself as shōgun. Yoritomo governed Japan as military dictator from the eastern city of Kamakura with the emperor of Japan and his Imperial Court in the official capital city of Heian-kyō (Kyoto) as figureheads. The Kamakura shōguns were members of the Minamoto clan until 1226, the Fujiwara clan until 1252, and the last six were minor princes of the imperial family. The Hōjō clan were the de facto rulers of Japan as shikken (regent) of the shōgun from 1203. The Kamakura shogunate saw the Jōkyū War in 1221 and the Mongol invasions of Japan under Kublai Khan in 1274 and 1281. The Kamakura shogunate was overthrown in the Kenmu Restoration under Emperor Go-Daigo in 1333, re-establishing Imperial rule until Ashikaga Takauji and his offspring overthrew the imperial government and founded the Ashikaga shogunate in 1336 (Nanboku-chō period).

The Hōjō clan (Japanese: 北条氏, Hepburn: Hōjō-shi) was a Japanese samurai family who controlled the hereditary title of shikken (regent) of the Kamakura shogunate between 1203 and 1333. Despite the title, in practice the family wielded actual political power in Japan during this period compared to both the Kamakura shoguns, or the Imperial Court in Kyoto, whose authority was largely symbolic. The Hōjō are known for fostering Zen Buddhism and for leading the successful opposition to the Mongol invasions of Japan. Resentment at Hōjō rule eventually culminated in the overthrow of the clan and the establishment of the Ashikaga shogunate.

In Japan, the Sesshō (摂政) was a regent who was named to act on behalf of either a child emperor before his coming of age, or an empress regnant. The Kampaku (関白) was theoretically a sort of chief advisor for the Emperor, but was in practice the title of both first secretary and regent who assisted an adult emperor. The duties of the Sesshō and Kampaku were to convey to the Emperor the policies formulated by the Sadaijin (左大臣, Minister of the Left) and other senior officials of the Daijō-kan (太政官, Council of State), and to convey the Emperor's decisions to them. As regents of the Emperor, the Sesshō and Kampaku sometimes made decisions on behalf of the Emperor, but their positions were not defined by law and they had no specific political authority. The two titles were collectively known as sekkan (摂関), and the families that exclusively held the titles were called sekkan-ke (sekkan family).

During the Heian period (794–1185), from the middle of the 9th century, the Fujiwara clan began to marry off their daughters to the Emperor and assume the positions of Sesshō and Kampaku, thereby excluding other clans from the political centre and increasing their political power. From the 10th century, the Fujiwara clan monopolized the Sesshō and Kampaku, and at the end of the 10th century, around the time of Fujiwara no Michinaga and Fujiwara no Yorimichi, the power of the Fujiwara clan reached its zenith. In the mid-11th century, Emperor Go-Sanjo ran his own government, and the next Emperor, Shirakawa, abdicated to become Cloistered Emperor, beginning the cloistered rule. From then on, the cloistered rule of Cloistered Emperor took root, and the de facto Fujiwara regime, which used the positions of Sesshō and Kampaku, was over, and the Sesshō and Kampaku lost their real political power and became mere names.

Constantine XI Dragases Palaiologos or Dragaš Palaeologus (Greek: Κωνσταντῖνος Δραγάσης Παλαιολόγος, romanized: Kōnstantīnos Dragásēs Palaiológos; 8 February 1404 – 29 May 1453) was the last reigning Byzantine emperor from 23 January 1449 until his death in battle at the fall of Constantinople on 29 May 1453. Constantine's death marked the definitive end of the Eastern Roman Empire, which traced its origin to Constantine the Great's foundation of Constantinople as the Roman Empire's new capital in 330.

Constantine was the fourth son of Emperor Manuel II Palaiologos and Serbian noblewoman Helena Dragaš. Little is known of his early life, but from the 1420s onward, he repeatedly demonstrated great skill as a military general. Based on his career and surviving contemporary sources, Constantine appears to have been primarily a soldier. This does not mean that Constantine was not also a skilled administrator: he was trusted and favored to such an extent by his older brother, Emperor John VIII Palaiologos, that he was designated as regent twice during John VIII's journeys away from Constantinople in 1423–1424 and 1437–1440. In 1427–1428, Constantine and John fended off an attack on the Morea (the Peloponnese) by Carlo I Tocco, ruler of Epirus, and in 1428 Constantine was proclaimed Despot of the Morea and ruled the province together with his older brother Theodore and his younger brother Thomas. Together, they extended Roman rule to cover almost the entire Peloponnese for the first time since the Fourth Crusade more than two hundred years before and rebuilt the ancient Hexamilion wall, which defended the peninsula from outside attacks. Although ultimately unsuccessful, Constantine personally led a campaign into Central Greece and Thessaly in 1444–1446, attempting to extend Byzantine rule into Greece once more.

The Marinid dynasty (Arabic: المرينيون al-marīniyyūn) was a Berber Muslim dynasty that controlled present-day Morocco from the mid-13th to the 15th century and intermittently controlled other parts of North Africa (Algeria and Tunisia) and of the southern Iberian Peninsula (Spain) around Gibraltar. It was named after the Banu Marin (Arabic: بنو مرين, Berber: Ayt Mrin), a Zenata Berber tribe. It ruled the Marinid sultanate, founded by Abd al-Haqq I.

In 1244, after being at their service for several years, the Marinids overthrew the Almohads which had controlled Morocco. At the height of their power in the mid-14th century, during the reigns of Abu al-Hasan and his son Abu Inan, the Marinid dynasty briefly held sway over most of the Maghreb including large parts of modern-day Algeria and Tunisia. The Marinids supported the Emirate of Granada in al-Andalus in the 13th and 14th centuries and made an attempt to gain a direct foothold on the European side of the Strait of Gibraltar. They were however defeated at the Battle of Río Salado in 1340 and finished after the Castilians took Algeciras from the Marinids in 1344, definitively expelling them from the Iberian Peninsula. Starting in the early 15th century the Wattasid dynasty, a related ruling house, competed with the Marinid dynasty for control of the state and became de facto rulers between 1420 and 1459 while officially acting as regents or viziers. In 1465 the last Marinid sultan, Abd al-Haqq II, was finally overthrown and killed by a revolt in Fez, which led to the establishment of direct Wattasid rule over most of Morocco.

An interregnum (plural interregna or interregnums) is a period of discontinuity or "gap" in a government, organization, or social order. Archetypally, it was the period of time between the reign of one monarch and the next (coming from Latin inter-, "between" and rēgnum, "reign" [from rex, rēgis, "king"]), and the concepts of interregnum and regency therefore overlap. Historically, longer and heavier interregna have been typically accompanied by widespread unrest, civil and succession wars between warlords, and power vacuums filled by foreign invasions or the emergence of a new power.

The term also refers to the periods between the election of a new parliament and the establishment of a new government from that parliament in parliamentary democracies, usually ones that employ some form of proportional representation that allows small parties to elect significant numbers, requiring time for negotiations to form a government. In the UK, Canada and other electoral systems with single-member districts, this period is usually very brief, except in the rare occurrence of a hung parliament as occurred both in the UK in 2017 and in Australia in 2010. In parliamentary interregnums, the previous government usually stands as a caretaker government until the new government is established. Additionally, the term has been applied to the United States presidential transition, the period of time between the election of a new U.S. president and their inauguration, during which the outgoing president remains in power, but as a lame duck.

Prince Shōtoku (聖徳太子, Shōtoku Taishi; February 7, 574 – April 8, 622), also known as Prince Umayado (厩戸皇子, Umayado no ōjî, Umayado no miko) or Prince Kamitsumiya (上宮皇子, Kamitsumiya no ōji, Kamitsumiya no miko), was a semi-legendary regent and a politician of the Asuka period in Japan who served under Empress Suiko. He was the son of Emperor Yōmei and his consort, Princess Hashihito no Anahobe, who was also Yōmei's younger half-sister. But later, he was adopted by Prince Shōtoken. His parents were relatives of the ruling Soga clan and also he was involved in the defeat of the rival Mononobe clan. The primary source of the life and accomplishments of Prince Shōtoku comes from the Nihon Shoki. The Prince is renowned for modernizing the government administration and for promoting Buddhism in Japan. He also had two different families that fought over his custody.

Over successive generations, a devotional cult arose around the figure of Prince Shōtoku for the protection of Japan, the Imperial Family, and for Buddhism. Key religious figures such as Saichō, Shinran and others claimed inspiration or visions attributed to Prince Shōtoku.

A queen regnant (pl.: queens regnant) is a female monarch, equivalent in rank, title and position to a king. She reigns suo jure (in her own right) over a realm known as a kingdom; as opposed to a queen consort, who is married to a reigning king; or a queen regent, who is the guardian of a child monarch and rules pro tempore in the child's stead or instead of her husband who is absent from the realm, be it de jure in sharing power or de facto in ruling alone. A queen regnant is sometimes called a woman king. A princess, duchess, or grand duchess regnant is a female monarch who reigns suo jure over a principality or (grand) duchy; an empress regnant is a female monarch who reigns suo jure over an empire.

A queen regnant possesses all the powers, such as they may be, of the monarchy, whereas a queen consort or queen regent shares her spouse's or child's rank and titles but does not share the sovereignty of her spouse or child. The husband of a queen regnant traditionally does not share the queen regnant’s rank, title, or sovereignty and usually holds a lower princely title. However, the concept of a king consort is not unheard of in both contemporary and historical periods.