"A yugra elnevezés nem bukkan fel, korábban is szerepel, pl Fra Mauro 15. századi térképén yuguristan formában"

Mint azt a 17184.-ben írtam: "Jogoristant már Fra Mauro is jelöli (Tullia Gasparrini Leporace szerk.: Mappamondo di Fra Mauro; Instituto Poligrafico dello stato–Libreria dello Stato, Róma, 1956, XXXVIII–XXXIX. tábla)". Olschki megállapítja, hogy a velencei szerzetes ezt kétségtelenül honfitársától, Marco Polótól vette át (Marco Polo's Asia; University of California Press–Cambridge University Press, Berkeley–Los Angeles–London, 1960, 222.).

"We know who some of his sources were, as he made good use of Marco Polo for place-names and legends in Cathay, and Nicolò de' Conti for southeast Asia. Marco Polo's adventures had been mapped in a mural at the doge's palace, which was apparently still there in the 1450s. It was ordered to be repainted in 1459 and was destroyed by fire in 1483. (The map visible today was painted in the eighteenth century.) When Ramusio wrote his collection of Navigations in the sixteenth century, he averred that Fra Mauro used a map that Marco himself had made in Cathay and brought back with him, but no trace of such a map has ever been found. The Catalan Atlas of 1375 was the first surviving map to make use of Marco Polo's information from the East, and Fra Mauro does tha same." (Evelyn Edson: The World Map 1300–1492: The Persistence of Tradition and Transformation; John Hopkins University Press, 2007, Baltimore, 153.)