Earl of Warwick in the context of "Warwick Castle"

Suo jure is a Latin phrase, used in English to mean 'in his own right' or 'in her own right'. In most nobility-related contexts, it means 'in her own right', since in those situations the phrase is normally used of women; in practice, especially in England, a man rarely derives any style or title from his wife (an example is Richard Neville, Earl of Warwick from his wife's heritage) although this is seen in other countries when a woman is the last heir of her line. It can be used for a male when such male was initially a 'co-lord' with his father or other family member and upon the death of such family member became the sole ruler or holder of the title "in his own right" (alone).

It is commonly encountered in the context of titles of nobility or honorary titles, e.g. Lady Mayoress, and especially in cases where a woman holds a title through her own bloodline or accomplishments rather than through her marriage.

Richard Neville, 16th Earl of Warwick, 6th Earl of Salisbury, KG (22 November 1428 – 14 April 1471), known as Warwick the Kingmaker, was an English nobleman, administrator, landowner of the House of Neville fortune and military commander. The eldest son of Richard Neville, 5th Earl of Salisbury, he became Earl of Warwick through marriage, and was the wealthiest and most powerful English peer of his age, with political connections that went beyond the country's borders. One of the leaders in the Wars of the Roses, originally on the Yorkist side but later switching to the Lancastrian side, he was instrumental in the deposition of two kings, which led to his epithet of "Kingmaker".

Through fortunes of marriage and inheritance, Warwick emerged in the 1450s at the centre of English politics. Originally, he was a supporter of King Henry VI; however, a territorial dispute with Edmund Beaufort, Duke of Somerset, led him to collaborate with Richard, Duke of York, in opposing the king. From this conflict, he gained the strategically valuable post of Captain of Calais, a position that benefited him greatly in the years to come. The political conflict later turned into a full-scale rebellion, where in battle York was slain, as was Warwick's father Salisbury. York's son, however, later triumphed with Warwick's assistance and was crowned King Edward IV. Edward initially ruled with Warwick's support, but the two later fell out over foreign policy and the king's choice to marry Elizabeth Woodville. After a failed plot to crown Edward's brother, George, Duke of Clarence, Warwick instead restored Henry VI to the throne. The triumph was short-lived, however: on 14 April 1471, Warwick was defeated by Edward at the Battle of Barnet, and killed.

John Dudley, 1st Duke of Northumberland (1504 – 22 August 1553) was an English military officer and politician, who led the government of the young King Edward VI from 1550 until 1553, and unsuccessfully tried to install Lady Jane Grey on the English throne after the King's death. The son of Edmund Dudley, a minister of Henry VII executed by Henry VIII, John Dudley became the ward of Sir Edward Guildford at the age of seven. Dudley grew up in Guildford's household together with his future wife, Guildford's daughter Jane, with whom he was to have 13 children. Dudley served as Vice-Admiral and Lord High Admiral from 1537 until 1547, during which time he set novel standards of navy organisation and was an innovative commander at sea. He also developed a strong interest in overseas exploration. Dudley took part in the 1544 campaigns in Scotland and France and was one of Henry VIII's intimates in the last years of the reign. He was also a leader of the religious reform party at court.

In 1547, Dudley was created Earl of Warwick and, with the Duke of Somerset, England's Lord Protector, distinguished himself in the renewed Scottish war at the Battle of Pinkie Cleugh. During the country-wide uprisings of 1549 Dudley put down Kett's Rebellion in Norfolk. Convinced of the Protector's incompetence, he and other privy councillors forced Somerset out of office in October 1549. Having averted a conservative reaction in religion and a plot to destroy him alongside Somerset, Dudley emerged in early 1550 as de facto regent for the 12-year-old Edward VI. He reconciled himself with Somerset, who nevertheless soon began to intrigue against him and his policies. Somerset was executed on largely fabricated charges, three months after Dudley had been raised to the Dukedom of Northumberland in October 1551.

Jane Dudley, Duchess of Northumberland (née Guildford; 1508/1509 – 15 or 22 January 1555) was an English courtier. She was the wife of John Dudley, 1st Duke of Northumberland, and mother of Guildford Dudley and Robert Dudley, 1st Earl of Leicester. Having grown up with her future husband, who was her father's ward, she married at about age 16. They had 13 children.

Jane Dudley served as a lady-in-waiting at the court of Henry VIII and was a close friend of his final wife, Katherine Parr. Reformed in religious outlook, she was also a supporter of the Protestant martyr Anne Askew. Under the young Edward VI, John Dudley became one of the most powerful politicians, rising to be Earl of Warwick and later Duke of Northumberland. After the fall of Lord Protector Somerset in 1549, John Dudley joined forces with his wife to promote his rehabilitation and a reconciliation between their families, which was symbolised by a marriage between their children.