558 The Hagia Sophia (in Constantinople) collapsed.
Justinian I immediately ordered that the dome be rebuilt.
1274 in France, the
Second Council of Lyons opened, which addressed the union of the Eastern and
Western churches, regulating the election of the Pope and church reform.
Charles University in Prague (Universitas Carolina/Univerzita Karlova) was
established as the first university in Central Europe.
1429 English siege of
Orleans broken by Joan of Arc.