The Genevese physician Jean-Jacques Manget, in his 1721 work "Treatise on the Plague" written just after the Great Plague of Marseille, describes the costume worn by plague doctors at Nijmegen in 1636–1637. The costume forms the frontispiece of Manget's 1721 work. Their robes, leggings, hats, and gloves were also made of Morocco leather. This costume was also worn by plague doctors during the Plague of 1656, which killed 145,000 people in Rome and 300,000 in Naples.