My Lord John is an unfinished historical fiction novel by the British author Georgette Heyer, published posthumously in 1975 after her death the previous year. It traces the early lives of the "young lordings" – Harry, Thomas, John, and Humfrey – all sons of the future Lancastrian king Henry IV of England. They grow up amidst turbulent events including the 1394 pestilence, the exile of their father by Richard II, the death of their powerful grandfather John of Gaunt, and the seizure of the throne by their father. John of Lancaster serves as the novel's main character. Heyer intended the novel to be the first instalment in a trilogy covering the House of Lancaster at the peak of its power (1393–1435), with John as its central character. She felt that John, now largely unknown today, was ideal because he was a "great man" who lived during the entirety of her selected time period and was the most trusted brother of Henry V. However, Heyer failed to complete the trilogy, finding herself distracted with the writing of her popular Regency novels to please her fans and offset her tax liabilities. She died in 1974, and My Lord John was published by her family a year later. It covered only the early life of John of Lancaster, from 1393 to 1413. Upon its publication, My Lord John garnered a mostly negative reception from contemporary readers and literary critics, who felt that it lacked narrative flow and was inferior to Heyer's Regency novels. Modern critics also have viewed the work unfavourably. Featuring significant historical detail, it has been labelled "more serious" than her previous undertakings; one reviewer felt it resembled a historical narrative more than a novel. A German translation was released in 1980. Background and development Georgette Heyer is best known for writing romantic stories set in the Regency era, but her body of work encompassed many different historical periods, including the English Civil War and the Middle Ages. One of her favoured periods centred on the House of Lancaster's peak of power, between 1393 and 1435. In 1950, Heyer began working on what she called "the magnum opus of my latter years", a medieval trilogy intended to cover the House of Lancaster during that period. She estimated that she would need five years to complete this project. Her impatient readers continually clamoured for new books, however; to satisfy them and her