Cathay Jan Pieterszoon Coen to embark on an "unfortunate" (for the Dutch) policy of treating the Ming Empire as "merely another 'oriental' kingdom". The last nail into the coffin of the idea of there being a Cathay as a country separate from China was, perhaps, driven in 1654, when the Dutch Orientalist Jacobus Golius met with the China-based Jesuit Martino Martini, who was passing through Leyden. Golius knew no Chinese, but he was familiar with "Zij-i Ilkhani", a work by the Persian astronomer Nasir al-Din al-Tusi, completed in 1272, in which he described the Chinese ("Cathayan") calendar. Upon meeting Martini, Golius
Cathay his "Book on the Administration of the State", apparently as two separate countries (presumably, referring to the Liao and Song Empires, respectively). The name's currency in the Muslim world survived the replacement of the Khitan Liao dynasty with the Jurchen Jin dynasty in the early 12th century. When describing the fall of the Jin Empire to the Mongols (1234), Persian history described the conquered country as "Khitāy" or "Djerdaj Khitāy" (i.e., "Jurchen Cathay"). The Mongols themselves, in their "Secret History" (13th century) talk of both Khitans and Kara-Khitans. In about 1340 Francesco Balducci Pegolotti, a merchant from Florence, compiled the