Hayton of Corycus (also Hethum, Het'um, and variants; in Armenian known as Հեթում Պատմիչ Hetʿowm Patmičʿ "Hethum the Historian" ; c.1240 - c.1310-1320) was a medieval Armenian nobleman, monk and historiographer.
Hayton is the author of La Flor des Estoires d'Orient ("Flower of the Histories of the East", in Latin Flos historiarum terre Orientis), a historiographical work about the history of Asia, especially about the Muslim conquests and the Mongol invasion, which he dictated at the request of Pope Clement V in 1307, while he was at Poitiers. The Old French original text was recorded by one Nicolas Faulcon, who also prepared a Latin translation. The work was widely disseminated in the Late Middle Ages and was influential in shaping western European views of the Orient.
The work consists of four books of unequal lengths, the main part being contained in book 3, after which the entire work is sometimes referred to as the "History of the Tartars". Book 1 gives an overview of the geography and history of Asia. Book 2 gives an account of the "Lordship of the Saracens", i.e. the Muslim conquests of the 7th century and the succeeding Caliphates. Book 3 comprises the bulk of the work, giving a history of the Mongols and the Mongol invasions. Book 4 discusses a proposed alliance of Christendom with the Mongol Empire to the end of a renewed crusade in the Holy Land. For his history of the Mongols Hayton names an Estoires des Tartars ("History of the Tartars") as his source for the time until the reign of Möngke Khan (1250s), while for more recent events, he relies on the accounts by his great-uncle, king Hethum I, and on his own experiences. He is also informed by western sources on the history of the Crusades, and most likely draws on the travelogues of Giovanni da Pian del Carpine and Marco Polo.