Dated from the early 4th century, the is the oldest standing edifice in Sofia When Emperor divided the province of into on the banks of the and , Serdica became the capital of the latter.
from the original on 28 April 2013.
Nevertheless, in the 21st century, crimes, including killings, caused problems in the city, where authorities had difficulties convicting the actors, which had caused the to warn the Bulgarian government that the country would not be able to join the EU unless it curbed crime Bulgaria eventually joined in 2007.
from the original on 14 July 2020.
In 1944 Sofia and the rest of Bulgaria was occupied by the Soviet and within days of the Soviet invasion Bulgaria declared war on Nazi Germany.
from the original on 4 March 2016.