Main cause was the black death
The United Nations was a community of countries around the world which was formed after the course of the second world war. The league was established in order to maintain global peace and cooperation among nations. In addition, its Millennium Goals was set as an objective to eradicate poverty among third world countries.
Justinian I, Emperor of the Byzantine Empire, ordered the landmark church of Hagia Sophia in Constantinople. It was built by Greek scientists Isidore of Miletus and Anthemius of Tralles. Hagia Sophia was an Orthodox Christian Church, then became a Roman Catholic Church and then became a mosque, before it became secularized and became a museum, which is open today and attracts many tourists.
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