Transylvania the Romanian population of Transylvania gathered in Alba Iulia on 1 December 1918 to proclaim the union of Transylvania with the Kingdom of Romania. In Transylvania, there are many medieval smaller towns such as Sighișoara, Mediaș, Sebeș, and Bistrița. Official censuses with information on Transylvania's population have been conducted since the 18th century. On May 1, 1784 the Emperor Joseph II called for the first official census of the Habsburg Empire, including Transylvania. The data was published in 1787, and this census showed only the overall population (1,440,986 inhabitants). , a 19th-century Hungarian statistician, estimated in 1842 that in the
Celts in Transylvania the River Tisa is depicted in 2nd century BC pottery found at Pecica in Arad County, a prosperous trading center at the confluence of the two peoples. A classic period of Geto-Dacian La Tène culture began in the 1st century BC centered around the city of Sarmizegetusa Regia in south-western Transylvania. Dacian king Burebista defeated the Celtic Boii and Taurisci tribes between 60–59 BC. However, some archaeological finds in Dacian settlements and fortifications feature imported Celtic vessels and others made by Dacian potters imitating Celtic prototypes. These discoveries in sites from regions north and west of Transylvania show that relations