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.
1348 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.