In 1593 Camden became headmaster of Westminster School. He held the post for four years, but left when he was appointed Clarenceux King of Arms. By this time, largely because of the "Britannia"'s reputation, he was a well-known and revered figure, and the appointment was meant to free him from the labour of teaching and to facilitate his research. The College of Arms at that time was not only a centre of genealogical and heraldic study, but also a centre of antiquarian study. The appointment, however, roused the jealousy of Ralph Brooke, York Herald, who, in retaliation, published an attack on "Britannia", charging Camden with inaccuracy and plagiarism. Camden successfully defended himself against the charges in subsequent editions of the work.