Isle of Man

City · c. 1085 CE · in Europe

Capital of Kingdom of the Isles (1085–1176), Kingdom of Mann (1177–1266).

Castletown (c. 1085 CE): Capital of Kingdom of the Isles (1085–1176), Kingdom of Mann (1177–1266).
Castelló d'Empúries (c. 1078 CE): Capital of County of Ampuria (1078–1402).
Sigmaringen (1077 CE): Capital of Principality of Hohenzollern-Sigmaringen (1806–1850).
Sivas (c. 1094 CE): Capital of Danishmendids (1094–1178).
Zagreb (1094 CE): Capital of Independent State of Croatia (1941–1944), Republic of Croatia (1992–today).
Iznik (c. 1094 CE): Capital of Sultanate of Rum (1094–1307), Nicaean Empire (1206–1261).
Nicaea (c. 1094–1261 CE): Capital of Sultanate of Rum (1094–1098), Nicaean Empire (1206–1261).
Stari Ras (c. 1094–1168 CE): Capital of Grand Principality of Serbia (1094–1168).
Ryazan (1095 CE): Capital of Principality of Ryazan (1097–1240), Ryazan (1453–1520).
Valladolid (1072 CE): Capital of Crown of Castile (1236–1515), Pro-Habsburg Spain (1702–1708).

Around the same time and place

Council of Clermont (1095 CE): Pope Urban II called on Western Christians to aid Byzantium and take Jerusalem, launching the First Crusade.
William the Conqueror (c. 1028 CE – 1087 CE): Duke of Normandy who conquered England in 1066 and became its first Norman king.
Battle of Hastings (1066 CE): William, Duke of Normandy, defeated and killed King Harold II, beginning the Norman conquest of England.
University of Oxford (c. 1096 CE): Teaching existed at Oxford by 1096, making it the oldest university in the English-speaking world. It grew rapidly after Henry II barred English students from the University of Paris in 1167.
Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
Cnut the Great (c. 990 CE – 1035 CE): Danish prince who became king of England, Denmark and Norway, ruling a North Sea empire.
Oslo (1048 CE): Capital of Kalmar Union (1402–1523), Denmark-Norway (1536–1814), Kingdom of Norway (1814–today).
Bayeux Tapestry (c. 1070 CE): Embroidered cloth nearly 70 metres long depicting the events leading up to and including the Norman conquest of England.