William of Ockham (d.1347/1350), 266 , 303
William of Rubruck, 243
William the Marshal (d.1219), 218
William I the Conqueror, king of England (r.1066–1087), 173 –75
William IX, duke of Aquitaine (1071–1126), 214
Winchester, 161
Wittenberg, 322
Worms, Concordat of (1122), 169
Wyclif, John (c.1330–1384), 303
Wynfrith. See Boniface, Saint
Yaroslav the Wise, prince of Kiev (r.1019–1054), 121
Yeavering (Northumberland), 60 , 60
Yorkists, 295
genealogy, 296
Zacharias, pope (741–752), 97
Zangi, 173 , 198
Zanj, 123
Zeno, Roman emp. (r.474–491), 24
Zoe, Byzantine empress (d.1050), 117