558

By place

Byzantine Empire

• May 7 – In Constantinople, the dome of the Hagia Sophia collapses due to an earthquake. Emperor Justinian I orders the dome to be rebuilt.

  Europe

• The Avars and the Slavs occupy the Hungarian Plain on the Balkans. The threat of Avar domination prompts the Lombards to migrate to Italy.
• December 13 – King Chlothar I reunites the Frankish Kingdom after his brother Childebert I dies, becoming sole ruler of the Franks.
• Conall mac Comgaill becomes king of Dál Riata, a Gaelic overkingdom on the western coast of Scotland.

  Asia

• Istämi, ruler of the Western Turkic Khaganate, establishes diplomatic relations with the Byzantine Empire.

  By topic

Religion

• December 23 – The Abbey of Saint-Germain-des-Prés is dedicated by Germain, bishop of Paris.
• The Bangor Abbey is founded by the Irish abbot Comgall in Northern Ireland.