Sir Andrew Dudley, KG was an English soldier, courtier, and diplomat. A younger brother of John Dudley, 1st Duke of Northumberland, he served in Henry VIII's navy and obtained court offices under Edward VI. In 1547–1548 he acted as admiral of the fleet and participated in the War of the Rough Wooing in Scotland, where he commanded the English garrison of Broughty Castle. He was appointed captain of the fortress of Guînes in the Pale of Calais in late 1551. There he got involved in a dispute with the Lord Deputy of Calais, which ended only when both men were replaced in October 1552.

John Dudley, 1st Duke of Northumberland was an English general, admiral, 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 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.