Final answer:
Historically, there is no specific evidence about Henry V hiring someone to write a Valentine's Day card to Catherine of Valois. Royal scribes or secretaries may have written correspondences, but the practice of sending Valentine's cards was not common in the 15th century.
Step-by-step explanation:
The question 'Whom did Henry V hire to write his Valentine’s Day card to Catherine of Valois?' appears to reference a historical figure but might actually be conflated with fictional or anecdotal accounts. In historical records, there's no specific document or evidence detailing who, if anyone, was hired by King Henry V to write a Valentine's Day card to Catherine of Valois. The royal court would have had various secretaries and scribes capable of composing such correspondences, and it's also possible that individuals like poets or artists could have been commissioned for their literary skills. However, the writing of Valentine's Day cards is not a practice commonly associated with the 15th century when Henry V would have been involved with Catherine of Valois.
In contrast to Henry V, another English King, Henry VIII, had notable marital issues that are well-documented, including his marriages to Catherine of Aragon and subsequent wives. His requests for annulment, break from the Catholic Church, and the creation of the Church of England were significant outcomes of his marital challenges, but these events are unrelated to the question at hand.
Concerning historical romantic gestures, there is a record of Henry IV of France getting his first view of Marie de Medici through a portrait, as illustrated in the painting, 'The Presentation of Marie de Medici's Portrait to Henry IV', but this also does not pertain directly to Henry V or the crafting of Valentine's Day cards.