City history
From ancient Thracian Serdica to its 1894 adoption of Eastern European Time, Sofia harmonizes a rich naming legacy with modern Balkan timekeeping.
Chapter one
Earliest documented name
"Town of the Serdi"
Derived from the Thracian Serdi tribe who settled the Sofia Valley, Serdica was recorded by ancient Roman and Greek writers after the area was annexed into the Roman Empire.
Settlement of the Serdi
Established as a Thracian settlement by the Serdi tribe and later expanded into a fortified Roman regional capital in Dacia Mediterranea.
Trinity or Three Watersheds
Refers to the Byzantine Greek name used after Emperor Justinian I rebuilt and re-fortified the city following 5th-century Hun invasions.
Middle or Center
Adopted after Bulgarian Khan Krum conquered the city in 809, highlighting its strategic central location in the Balkan Peninsula.
Holy Wisdom
First documented in the 14th-century Vitosha Charter of Tsar Ivan Shishman, taking its name from the prominent 6th-century Saint Sofia Basilica.
Chapter two
Sofia transitioned from local solar time to Istanbul Mean Time (UTC+01:56:56) to coordinate early Balkan telegraph and railway operations.
Bulgaria officially adopted Eastern European Time (EET, UTC+2) on November 30, standardizing national timekeeping for international transit networks.
Bulgaria transitioned from the Julian to the Gregorian calendar on March 31, advancing local dates by 13 days for international synchronization.
Bulgaria introduced daylight saving time temporarily during World War II between 1943 and 1944 before returning to standard EET.
Bulgaria reestablished regular annual Daylight Saving Time (EEST, UTC+3) by ministerial decree to boost summer energy efficiency across the country.
Chapter three
Emperor Galerius promulgated the Edict of Serdica, ending imperial persecution of Christians and marking a pivotal historical moment in late antiquity.
The original Neo-Renaissance Sofia Central Railway Station opened on August 1, featuring a prominent clock tower that regulated national train departure times.
The Sofia University Observatory in Borisova Gradina installed its historic 6-inch Grubb refractor telescope, laying the foundation for national astronomical observations.
Sofia opened its Central Market Hall, showcasing a distinctive three-faced clock mounted on an arched tower that served as a central urban landmark.