A coregency is the situation where a monarchical position (such as prince, princess, king, queen, emperor or empress), normally held by only a single person, is held by two or more. It is distinct from diarchies or duumvirates (such as Andorra, ancient Sparta and Rome), where monarchical power is permanently divided between two rulers; and also from regencies, where a person, who is not legally monarch themselves, exercises monarchical power on the behalf of reigning monarch who is absent or unable to rule (for example due to illness or young age).
In Ancient Egypt, coregency was quite problematic as the Pharaoh was seen as the incarnation/representation of the god Horus. Therefore, according to the divine order Ma'at, only one King could exist at the same time. Yet, exceptions can be found, mainly in the Middle Kingdom, where the pharaoh occasionally appointed his successor (often one of his sons) as coregent, or joint king, to ensure a smooth succession. “This system was used, from at least as early as the Middle Kingdom, in order to ensure that the transfer of power took place with the minimum of disruption and instability”.[2] Coregencies are highly probable for Amenemhat I > Senusret I > Amenemhat II > Senusret II.[3] Most probably the real king in power was the older one (father) adopting the younger ruler (son), while the co-regent had to wait until after the death of the older one to really have access to full royal power. Yet, the years of reigns normally were counted from the beginning of the coregency on. Due to this and to the fragmentary character of known sources, the establishment of Egyptian chronology was quite complicated and remains disputed up to date. Yet, understanding the existence of co-regency reduced the chaos quite a lot.
The institution of coregency is different from that of regency, where an adult person (in Ancient Egypt often the mother of the king) functions as Legal guardian, ruling in the name of the underage king. Some of the female regents of Egypt rose to a status of equal to the God-Kings, becoming co-rulers as can be seen in the famous case of Hatshepsut. After the death of her husband Thutmose II, Hatshepsut ruled in the name of Thutmose III, her nephew and stepson. Then, latest in year 7[4] of Thutmose III's reign, she took over royal regalia and was then titled King of Egypt under the Throne name (prenomen) Maatkare. For later periods of Pharaonic Egyptian history, the existence of the institution of coregency has been put into question by Egyptologists,[5] while, "the Ptolemaic and Roman period examples being the most securely identified".[2]
In Hellenized Egypt during the Ptolemaic period, Arsinoe II was given the title of nswt-bjtj, which is usually translated as "King of Upper and Lower Egypt". Later royal wives like Berenice II, Arsinoe III and Cleopatra I Syra got were given the feminine form of the pharaohnic titulary of their husbands, including "female Horus", "female pharaoh" and "female ruler", which is sometimes interpreted as a sign of coregency with their spouses.[6][7] However, neither of them appear as formal co-ruler in official protocols mentioning their husbands's regnal years.[8]
Official coregency between two royal spouses, when both were named as co-rulers in Hellenistic administration of the country, was for the first time introduced when Cleopatra II was named as co-ruler alongside her brothers: Ptolemy VI (her husband) and Ptolemy VIII Physcon.[9] After their reign, coregency continue in various forms, like simultaneous rule of siblings, spouses or parent and child, and it seems that from ideological point of view king was unable to rule without queen as his co-ruler, and likewise.[10]
King Henry II of England installed his eldest surviving son, also named Henry, as junior king. Henry the Young King was not permitted to exercise royal authority and his title as co-king was effectively a sinecure to denote his status as his father's chosen heir. Young Henry predeceased his father without ever ascending to the throne and is not included in the official list of English monarchs.
Following the extinction of the Carolingian dynasty in West Francia, the Western Frankish nobles elected Hugh Capet as their new king. Upon his ascension Hugh secured the election of his only son Robert as his co-king.[12] As such, when Hugh died it did not trigger an election for a new king, nor did Robert necessarily "inherit" the crown, but simply continued his kingship. Subsequent Capetian kings would also name their eldest son or brother as co-ruler, until the tradition of agnatic primogeniture was sufficiently established to transform the King of France from an elected monarch to a hereditary one.[13]
The Lithuanian Grand Dukes typically selected submonarchs from their families or loyal subjects to assist controlling the Grand Duchy. However, the Grand Dukes remained superior.
A slightly different system developed for a brief period after Vytautas became Grand Duke, where nominally Vytautas ruled together with Jogaila, who took the title of aukščiausiasis kunigaikštis (Supreme Duke), but he has not once used the title to take any action, and in general the powers invested in the title were not clearly stated in any documents, besides the Pact of Horodlo, which guaranteed that Jogaila would have to approve the selection of a Lithuanian Grand Duke. The title was not used by any other king of Poland after Jogaila.
It was common during the Principate for a Roman emperor or Augustus to appoint Caesar as designated heir and junior co-emperor, in many cases adopting them as their son, who did not necessarily have to be biologically related to them. This was merely a tradition and not a formal office until the Tetrarchy, which attempted to codify this arrangement, but quickly fell apart. It regained significance, including under Zeno, as well as when Justin I had his nephew Justinian named co-emperor shortly before his own death, Constantine IV was also named co-emperor by his father Constans II and who himself had several other co-emperors, and the practice was common in the centuries to come up through the Palaiologans.
Following the death of Tsar Feodor III of Russia in 1682, his brother Ivan and half-brother Peter were both crowned autocrats of Russia. This compromise was necessary because Ivan was unfit to rule due to physical and mental disabilities, while Peter's exclusive rule was opposed by Feodor and Ivan's older sister Sofia Alekseyevna, who led a Streltsy uprising against him and his mother's family. Because neither Tsar was of age to rule, Sofia subsequently claimed regency until she was removed from power by Peter in 1689. Ivan V and Peter I's joint reign continued, however, with Ivan maintaining formal seniority despite having little participation in the affairs of the state until his death in 1696, at which point Peter became the sole ruler.
Coregency is a special feature of the Trần dynasty, in which a senior king abdicated in favor of his chosen heir. This abdication, however, is only in name, as the abdicated king continued to rule while his successor sat on the throne as a learner.[14]
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