James VII and II (14 October 1633 O.S. 16 September 1701) was King of England and Ireland as James II, and King of Scotland as James VII from the death of his elder brother, Charles II, on 6 February 1685. He was deposed in the Glorious Revolution of 1688. He was the last Catholic monarch of England, Scotland, and Ireland. His reign is now remembered primarily for struggles over religious tolerance, but it also involved struggles over the principles of absolutism and the divine right of kings. His deposition ended a century of political and civil strife in England by confirming the primacy of the English Parliament over the Crown.James inherited the thrones of England, Ireland, and Scotland from his brother with widespread support in all three countries, largely because the principles of eligibility based on divine right and birth were widely accepted. Tolerance of his personal Catholicism did not extend to tolerance of Catholicism in general, and the English and Scottish Parliaments refused to pass his measures. When James attempted to impose them by decree, this was met with opposition; some academics have however argued that it was a political principle, rather than a religious one, that ultimately led to his removal.In June 1688, two events turned dissent into a crisis; the first, on 10 June, was the birth of James's son and heir James Francis Edward, which raised the prospect of initiating a Roman Catholic dynasty and excluding his Anglican daughter Mary and her Protestant husband William III of Orange. The second was the prosecution of the Seven Bishops for seditious libel; this was viewed as an assault on the Church of England and their acquittal on 30 June destroyed his political authority in England. The anti-Catholic riots in England and Scotland that ensued led to a general feeling that only his removal from the throne could prevent a civil war.Leading members of the English political class invited William of Orange to assume the English throne; after he landed in Brixham on 5 November 1688, James's army deserted, and he went into exile in France on 23 December. In February 1689, a special Convention Parliament held that the king had "vacated" the English throne and installed William and Mary as joint monarchs, thereby establishing the principle that sovereignty derived from Parliament, not birth. James landed in Ireland on 14 March 1689 in an attempt to recover his kingdoms but, despite a simultaneous rising in Scotland, in April a Scottish Convention followed that of England, both finding that James had "forfeited" the throne and offered it to William and Mary. After his defeat at the Battle of the Boyne in July 1690, James returned to France, where he spent the rest of his life in exile at Saint-Germain, protected by Louis XIV. His opponents often portrayed him as an absolutist tyrant. By contrast, beginning in the 20th century, some historians praised him for advocating religious tolerance. More recent scholarship has tended to take a middle ground between these views.

William III (William Henry; Dutch: Willem Hendrik; 4 November 1650 – 8 March 1702), also widely known as William of Orange, was the sovereign Prince of Orange from birth, Stadtholder of Holland, Zeeland, Utrecht, Guelders, and Overijssel in the Dutch Republic from the 1670s, and King of England, Ireland, and Scotland from 1689 until his death in 1702. As King of Scotland, he is known as William II. He is sometimes informally known as "King Billy" in Ireland and Scotland. His victory at the Battle of the Boyne in 1690 is commemorated by Unionists, who display orange colours in his honour. He ruled Britain alongside his wife and cousin Queen Mary II, and popular histories usually refer to their reign as that of "William and Mary".

William was the only child of William II, Prince of Orange, and Mary, Princess Royal and Princess of Orange, the daughter of Charles I of England, Scotland, and Ireland. His father died a week before his birth, making William III the Prince of Orange from birth. In 1677, he married Mary, the eldest daughter of his maternal uncle James, Duke of York, the younger brother of Charles II of England, Scotland, and Ireland. The Protestant William participated in several wars against the powerful Catholic French ruler Louis XIV in coalition with both Protestant and Catholic powers in Europe. Many Protestants heralded William as a champion of their faith. In 1685, his Catholic uncle and father-in-law, James, became king of England, Scotland, and Ireland. James's reign was unpopular with the Protestant majority in Britain, who feared a revival of Catholicism. Supported by a group of influential British political and religious leaders, William invaded England in what became known as the Glorious Revolution. In 1688, he landed at the south-western English port of Brixham. Shortly afterwards, James was deposed.

William's reputation as a staunch Protestant enabled him and his wife to take power. During the early years of his reign, William was occupied abroad with the Nine Years' War (1688–1697), leaving Mary to govern Britain alone. She died in 1694. In 1696 the Jacobites, a faction loyal to the deposed James, plotted unsuccessfully to assassinate William and restore James to the throne. William's lack of children and the death in 1700 of his nephew Prince William, Duke of Gloucester, the son of his sister-in-law Anne, threatened the Protestant succession. The danger was averted by placing distant relatives, the Protestant Hanoverians, in line to the throne with the Act of Settlement 1701. Upon his death in 1702, the king was succeeded in Britain by Anne and as titular Prince of Orange by his cousin John William Friso, beginning the Second Stadtholderless period.