Troyes

City · c. 1125 CE · in Europe

Capital of County of Champagne (1125–1200).

Rostov Veliky (c. 1125 CE): Capital of Principality of Rostov-Suzdal (1125–1240), Principality of Vladimir-Suzdal (1294–1389).
Huining (1124–1173 CE): Capital of Great Jin (1126–1153).
Inowroclaw (1120 CE): Capital of Duchy of Kuyavia (1188–1205).
Santiago de Compostela (c. 1111 CE): Capital of Kingdom of Galicia (1111–1125).
Tripoli (c. 1111 CE): Capital of County of Tripoli (1111–1289).
Minsk (c. 1111 CE): Capital of Principality of Minsk (1111–1313), Republic of Belarus (1992–today).
Halebidu (c. 1111 CE): Capital of Hoysala Kingdom (1111–1343).
Plock (c. 1139 CE): Capital of Duchy of Masovia (1139–1351).
Guimarães (c. 1139 CE): Capital of County of Portugal (1139–1143).
Sandomierz (c. 1139 CE): Capital of Duchy of Sandomierz (1139–1304).

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.
Reconquista (718–1492 CE): Centuries-long series of campaigns by Christian kingdoms to take the Iberian Peninsula from Muslim rule, ending with the fall of Granada in 1492.
William the Conqueror (c. 1028 CE – 1087 CE): Duke of Normandy who conquered England in 1066 and became its first Norman king.
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.
University of Paris (c. 1150 CE): Emerging around 1150 from the schools of Notre-Dame, the University of Paris became a leading centre of theology and philosophy in medieval Europe. Its college of the Sorbonne, founded in 1257, gave the university its popular name.
Notre-Dame de Paris (1163 CE): Gothic cathedral on the Île de la Cité, begun in 1163, famous for its flying buttresses, rose windows and sculpture.
Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
El Cid (c. 1043 CE – 1099 CE): Castilian knight Rodrigo Díaz de Vivar, who fought for Christian and Muslim rulers and conquered Valencia in 1094; hero of the Cantar de mio Cid.