Sofia ( or or ; , "", ) is the capital and largest city of Bulgaria. 1.26 million people live in the city and 1.68 million people live in its metropolitan area. The city is at the foot of Vitosha Mountain in the western part of the country. Being in the centre of the Balkan peninsula, it is midway between the Black Sea and the Adriatic Sea, and closest to the Aegean Sea. 

Sofia has been an area of human habitation since at least 7000 BC. Being Bulgaria's primate city, Sofia is a hometown of many of the major local universities, cultural institutions and commercial companies. Sofia is one of the top 10 best places for start-up business in the world, especially in information technologies. Sofia is Europe's most affordable capital to visit . 

For the longest time the city possessed a Thracian name, derived from the tribe "Serdi", who were either of Thracian, Celtic, or mixed Thracian-Celtic origin. The Serdi and the name of emperor Marcus Ulpius Traianus (53 – 117 AD) prompted the Romans to give the city the combinative name of "Ulpia Serdica"; Ulpia is derived from an Umbrian cognate of the Latin word "lupus", meaning "wolf." It seems that the first written mention of "Serdica" was made during his reign and the last mention was in the 19th century in a Bulgarian text (Сардакіи, "Sardaki"). During the Romans "civitas Serdenisium" was mentioned the "brightest city of the Serdi" in official inscriptions. The city was major throughout the past ever since Antiquity, when Roman emperor Constantine the Great referred to it as "my Rome", and it nearly became his capital.
Is it a small  city?
largest