[Austrvegr]

Finally, excerpts from memoirs of the French traveller Guilbert de Lannoy, who visited Russia in the early 15th century.
http://en.wikipedia.org/wiki/Gilbert_de_Lannoy

He calls the velikiy knyaz' of Moscow grant roy.




And I think that our Byelorussian comrades will find the following excerpt especially enlightening, because it mentions the velikiy knyaz' of Moscow alongside the velikiy knyaz' of Lithuania. The former is quite correctly translated as grant roy, and the latter, quite correctly again, as duc and prince.