when does a knight of the seven kingdoms take place

A Knight of the Seven Kingdoms takes place about 90 years before the events of Game of Thrones, during the Time of Heroes in Westeros. It centers around the adventures of Ser Duncan the Tall and his squire, Aegon V Targaryen, also known as Egg, and explores a relatively peaceful era before the Targaryen civil war called the Dance of the Dragons. This timeline distinctly sets it as a prequel to the main Game of Thrones series, focusing on the older generation of characters in the Seven Kingdoms.