Why is Edward grims account of thomas beckets death different to the film?

Edward Grim's account of Thomas Becket's death differs from the film primarily in its emphasis on the details of the event and the motivations behind the actions of the knights involved. Grim, who was present during the murder, provides a firsthand perspective that highlights Becket's steadfastness and martyrdom, while the film may dramatize or alter these elements for cinematic effect. Additionally, the film may condense events or characters for narrative clarity, leading to differences in the portrayal of the historical context and its implications. Overall, the variations reflect the balance between historical accuracy and artistic interpretation.