1684 'Dutch' edition of François Blondel’s reference work “Histoire du Calendrier Romain: qui contient son origine & les divers changemens qui lui sont arrivez", the first edition was published in 1662.

Rare 17th century account on ancient Rome and how the Romans began the Western concept of time keeping by François Blondel (1618-1686) soldier, engineer of fortifications, mathematician, diplomat, military and civil engineer, and architect, called "the Great Blondel", to distinguish him in a dynasty of French architects.