Yacovius (or Yakov) and Unekius, build two ships in the Dwina for discoveries to the north-east, [xci]
Yakan (Cape), [cix]
Yenisei, a river of Tartary, its course, [55]
Ys (Theunis, or Antonis), master of a trading vessel, who visited Novaya Zemlya, [xxxix], [xc]
Ysbrants (Brant), see Tetgales
Yugorsky Shar, see Vaigats Strait
Zeeland (merchants of), join in fitting out two ships for the first expedition, [ciii];
send two ships on the second expedition, [cxii]
Zivolka (a pilot in the Russian navy), his discoveries on the coast of Novaya Zemlya, [cxxxiv]