Question: Petras Jonaitis Mantigirdaitis, was a prominent noble of the Grand Duchy of Lithuania. in 494, Mantigirdaitis was sent on the diplomatic mission to negotiate peace with the Grand Duchy of Moscow and marriage of Helena of Moscow to where?
Sentence (from "Helena of Moscow"): The war ended with a six-year truce in 1503; the Grand Duchy of Lithuania lost about a third of its territory.
Relevant evidence: No