Anne, Queen of Great Britain in the context of "Treaty of Utrecht"

The Kingdom of Scotland was a sovereign state in northwest Europe, traditionally said to have been founded in 843. Its territories expanded and shrank, but it came to occupy the northern third of the island of Great Britain, sharing a land border to the south with the Kingdom of England. During the Middle Ages, Scotland engaged in intermittent conflict with England, most prominently the Wars of Scottish Independence, which saw the Scots assert their independence from the English. Following the annexation of the Hebrides and the Northern Isles from Norway in 1266 and 1472 respectively, and the capture of Berwick by England in 1482, the territory of the Kingdom of Scotland corresponded to that of modern-day Scotland, bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the southwest.

In 1603, James VI of Scotland became King of England, joining Scotland with England in a personal union. In 1707, during the reign of Queen Anne, the two kingdoms were united to form the Kingdom of Great Britain under the terms of the Acts of Union. The Crown was the most important element of Scotland's government. The Scottish monarchy in the Middle Ages was a largely itinerant institution, before Edinburgh developed as a capital city in the second half of the 15th century. The Crown remained at the centre of political life and in the 16th century emerged as a major centre of display and artistic patronage, until it was effectively dissolved with the 1603 Union of Crowns. The Scottish Crown adopted the conventional offices of western European monarchical states of the time and developed a Privy Council and great offices of state. Parliament also emerged as a major legal institution, gaining an oversight of taxation and policy, but was never as central to the national life. In the early period, the kings of the Scots depended on the great lords—the mormaers and toísechs—but from the reign of David I, sheriffdoms were introduced, which allowed more direct control and gradually limited the power of the major lordships.

The Kingdom of Great Britain, officially Great Britain, was a sovereign state in Western Europe from 1707 to the end of 1800. The state was created by the 1706 Treaty of Union and ratified by the Acts of Union 1707, which united the Kingdom of England (including Wales) and the Kingdom of Scotland to form a single kingdom encompassing the whole island of Great Britain and its outlying islands, with the exception of the Isle of Man and the Channel Islands. The unitary state was governed by a single parliament at the Palace of Westminster, but the distinct legal systems—English law and Scots law—remained in use, as did distinct educational systems and religious institutions, namely the Church of England and the Church of Scotland remaining as the national churches of England and Scotland respectively.

The formerly separate kingdoms had been in personal union since the Union of the Crowns in 1603 when James VI of Scotland became King of England and King of Ireland. Since the reign of James, who had been the first to refer to himself as "king of Great Britain", a political union between the two mainland British kingdoms had been repeatedly attempted and aborted by both the Parliament of England and the Parliament of Scotland. Queen Anne (r. 1702–1714) did not produce a clear Protestant heir and endangered the line of succession, with the laws of succession differing in the two kingdoms and threatening a return to the throne of Scotland of the Roman Catholic House of Stuart, exiled in the Glorious Revolution of 1688.

The Acts of Union refer to two acts of Parliament, one by the Parliament of Scotland in March 1707, followed shortly thereafter by an equivalent act of the Parliament of England. They put into effect the international Treaty of Union agreed on 22 July 1706, which politically joined the Kingdom of England and Kingdom of Scotland into a single "political state" named Great Britain, with Queen Anne as its sovereign. The English and Scottish acts of ratification took effect on 1 May 1707, creating the new kingdom, with its parliament based in the Palace of Westminster.

The two countries had shared a monarch since the "personal" Union of the Crowns in 1603, when James VI of Scotland inherited the English throne from his cousin Elizabeth I to become (in addition) 'James I of England', styled James VI and I. Attempts had been made to try to unite the two separate countries, in 1606, 1667, and in 1689 (following the Glorious Revolution in 1688, and subsequent deposition of James II of England by his daughter Mary and her husband William of Orange), but it was not until the early 18th century that both nations via separate groups of English and Scots Royal Commissioners and their respective political establishments, came to support the idea of an international "Treaty of political, monetary and trade Union", albeit for different reasons.

Sophia (German: Sophie, [zoˈfiː]; 14 October [O.S. 3 October] 1630 – 8 June [O.S. 28 May] 1714) was Electress of Hanover from 1692 to 1698 as the consort of Prince-Elector Ernest Augustus. She was later the heiress presumptive to the thrones of England and Scotland (later Great Britain) and Ireland under the Act of Settlement 1701, as she was the granddaughter of King James VI and I. Sophia died less than two months before she would have become Queen of Great Britain and Ireland. Consequently, her son George succeeded her first cousin once removed, Queen Anne, to the British throne. The succession to the throne has since been composed entirely of, and legally defined as, Sophia's legitimate and Protestant descendants.

Sophia was born in The Hague to Frederick V, formerly Elector Palatine and King of Bohemia, and Elizabeth (Stuart), daughter of King James VI and I. She grew up in the Dutch Republic, where her family had sought refuge after the sequestration of their Electorate during the Thirty Years' War. Sophia's brother Charles Louis was restored as elector in the Palatinate as part of the Peace of Westphalia. During this time, the English Stuarts also went into exile and Sophia was courted by her cousin, Charles II of England.

The House of Stuart, originally spelt Stewart, also known as the Stuart dynasty, was a royal house of Scotland, England, Ireland and later Great Britain. The family name comes from the office of High Steward of Scotland, which had been held by the family progenitor Walter fitz Alan (c. 1150). The name Stewart and variations had become established as a family name by the time of his grandson Walter Stewart. The first monarch of the Stewart line was Robert II; he and his descendants were monarchs of Scotland from 1371 and of England, Ireland and Great Britain from 1603, until 1714. Mary, Queen of Scots (r. 1542–1567), was brought up in France where she adopted the French spelling of the name Stuart.

In 1503, James IV married Margaret Tudor, thus linking the reigning royal houses of Scotland and England. Margaret's niece, Elizabeth I of England died without issue in 1603, and James IV's and Margaret's great-grandson James VI of Scotland acceded to the thrones of England and Ireland as James I in the Union of the Crowns. The Stuarts were monarchs of Britain and Ireland and its growing empire until the death of Queen Anne in 1714, except for the period of the Commonwealth between 1649 and 1660.

Mary II (30 April 1662 – 28 December 1694) was Queen of England, Scotland, and Ireland with her husband, King William III and II, from 1689 until her death in 1694. She was also Princess of Orange following her marriage on 4 November 1677. Her joint reign with William over Britain is known as that of William and Mary.

Mary was born during the reign of her uncle King Charles II. She was the eldest daughter of James, Duke of York (the future James II of England), and his first wife, Anne Hyde. Mary and her sister Anne were raised as Anglicans at the behest of Charles II, although their parents both converted to Roman Catholicism. Charles lacked legitimate children, making Mary second in the line of succession. At the age of 15, she married her cousin William of Orange, a Protestant. Charles died in 1685 and James became king, making Mary heir presumptive. James's attempts at rule by decree and the birth of his son from a second marriage, James Francis Edward (later known as "the Old Pretender"), led to his deposition in the Glorious Revolution of 1688 and the adoption of the English Bill of Rights.

There have been 13 British monarchs since the political union of the Kingdom of England and the Kingdom of Scotland on 1 May 1707. The first British monarch was Anne, who reigned between 1707 and 1714; the current monarch is Charles III since his accession in September 2022. Although the informal style of "King of Great Britain" had been in use since the personal union of England and Scotland on 24 March 1603 under James VI and I, the official title came into effect legislatively in 1707 and therefore British monarchs do not include monarchs who held both the title of Monarch of England and Monarch of Scotland at the same time.

On 1 January 1801, the Kingdom of Great Britain and the Kingdom of Ireland merged to create the United Kingdom of Great Britain and Ireland. This later became the United Kingdom of Great Britain and Northern Ireland upon the secession of the Irish Free State (now the Republic of Ireland) in the 1920s. British monarchs have also held various other titles reflecting their claims outside of the United Kingdom, including Elector of Hanover, Emperor of India, and Head of the Commonwealth; they also hold various secondary titles for land within the United Kingdom, such as the Duchy of Lancaster.