928 Lusatia is annexed by Germany, and the Bohemians bring Moravia into the German imperial system.
927 England annexes the Kingdom of York.
937 England successfully defends itself against a counter-offensive by Scots and the Vikings of Dublin. The Kingdom of Essex becomes the Kingdom of England.
948 Burgundy absorbs the Kingdom of Provence.
950 Amalfi splits from Naples.
955 King Otto I of Germany defeats the Magyars near Augsburg so convincingly that they became settled in the Alföld area.
961 Otto annexes Italy.
962 Otto enters Rome and receives the imperial crown from the Pope.
961The Byzantines recover Crete.
965 The Byzantines recover Cyprus.
969 The Byzantines take Antioch.
972 Igor's son, Sviatoslav, dies in a Patzinak ambush after a reign where he lead expeditions against the various Bulgar, Turk and Khazar peoples, none of which lead to permanent expansion of territory. However, he inflicted significant damage on the Khazars and Danube Bulgars, neither of which were to fully recover.
970 Navarre absorbs Aragon.
1000 Magyar Duke Stephan Arpad accepts a gift of coronation regalia from the Pope.
Venice annexes the coast of Istria and the nearer Dalmatian islands.
by 1000 The Kurds establish three marcher lordships. The Irish win back their island from the Vikings. We begin to see kingdoms forming in Norway, Sweden and Denmark.
The New Penguin Atlas of Medieval History, Colin McEvedy, pp 50-52
The Times History of Europe, Mark Almond et al., pp 68-69
Balts, Wikipedia
Kingdom of Poland, Wikipedia
Kievan Rus, Wikipedia