740 Constantinople earthquake

[1] In Constantinople, the earthquake caused the collapse of many public buildings.

The casualties in Constantinople reportedly included over 1,000 people.

[1] The earthquake reportedly destroyed a number of towns in Thrace.

It also damaged the cities of Nicaea (İznik), Nicomedia (İzmit), and Praenetus.

[1] The historians Theophanes the Confessor (8th-9th century) and George Kedrenos (11th century) reported that the earthquake caused the sea to retire away from the coast in many places.