Lüleburgaz, (Turkish: [lyˈlebuɾɡaz]; Thracian: Bergula, Bulgarian: Люлебургас or popularly Беркулен, Greek: Αρκαδιούπολις/Αρκαδιούπολη) is a town and district of Kırklareli Province in the Marmara region of Turkey. The city has a population of 100,412 (2010 census) and is the largest town in Kırklareli Province. Lüleburgaz is known for its sixteenth-century mosque and bridge, both named after the Grand Vizier Sokollu Mehmet Paşa and purportedly designed by the Ottoman chief architect Mimar Sinan. The economy of Lüleburgaz is mainly based on the industrial sector. There are various factories around the city. The ancient name of the city was Bergula; Emperor Theodosius I changed it to Arcadiopolis (Greek: Αρκαδιούπολις) in honour of his son and successor Arcadius. The Battle of Arcadiopolis (970) saw Byzantine forces defeat an invading Kievan-Pecheneg-Magyar force who were aiming to capture Constantinople, 100 miles to the east. The Battle of Lule Burgas (1912) was here in the First Balkan War. Lüleburgaz is the seat of the Roman Catholic titular arch-bishopric of Arcadiopolis in Europa.