First Edition. A treatise systematically examining hats and head coverings. The work addresses sacred and secular headwear, including Catholic episcopal mitres, cardinal’s hats, Jewish rabbinical caps, royal French crowns, and female headdresses. Raynaud, a 17th-century Jesuit theologian, situates headwear within religious, ceremonial, and social frameworks, providing historical context, usage, and symbolic significance. Vellum binding, clean pages, some discolouration, small loss to bottom margin of p. 11, not affecting text. The text reflects seventeenth-century Jesuit scholarship’s engagement with material culture and ritual practice, documenting headgear as a marker of office, status, and identity across religious and secular spheres.