The origins of modern Sofia lie in prehistory; the site was a centre of [[Thracian]] civilisation and later was the [[Roman]] city of Serdica. A thriving medieval centre, it is thought to have been called Sofia (Greek: 'wisdom') since the fourteenth century; it was formally renamed after liberation from the [[Ottoman Empire]] in 1878. In 1879 Sofia became capital of the newly formed Principality of Bulgaria. | The origins of modern Sofia lie in prehistory; the site was a centre of [[Thracian]] civilisation and later was the [[Roman]] city of Serdica. A thriving medieval centre, it is thought to have been called Sofia (Greek: 'wisdom') since the fourteenth century; it was formally renamed after liberation from the [[Ottoman Empire]] in 1878. In 1879 Sofia became capital of the newly formed Principality of Bulgaria. |