There is evidence of human settlement in the area dating to the Middle Paleolithic, some 60,000 years ago. The Dacians established a town that Ptolemy in his Geography calls Patreuissa, which is probably a corruption of Patavissa or Potaissa, the latter being more common. It was conquered by the Romans, who kept the name Potaissa, between AD 101 and 106, during the rule of Trajan, together with parts of Decebal‘s Dacia.
Milliarium of Aiton is an ancient Roman milestone dating from 108 AD, shortly after the Roman conquest of Dacia, and showing the construction of the road from Potaissa to Napoca, by demand of the Emperor Trajan. It indicates the distance of 10,000 feet (3,000 m) (P.M.X.) to Potaissa. This is the first epigraphical attestation of the settlements of Potaissa and Napoca in Roman Dacia.
This milliarium is an attestation of the road known to be built by Cohors I Hispanorum miliaria.
The Potaissa salt mines were worked in the area since prehistoric times.
Saxons settled in the area in the 11th century. The town was destroyed during the Tartar invasion in 1241–1242. Andrew III of Hungary gave royal privileges to the settlement. These privileges were later confirmed by the Angevins of Hungary.
The Hungarian Diet was held here in 1467, by Matthias Corvinus. Later, in the 16th century, Turda was often the residence of the Transylvanian Diet, too. The 1558 Diet of Turda declared free practice of both the Catholic and Lutheran religions.
In 1918, Transylvania united with Romania, and Turda with it. In 1944, the Battle of Turda took place here, between German and Hungarian forces on one side and Soviet and Romanian forces on the other. It was the largest battle fought in Transylvania during World War II.
According to the last Romanian census from 2011 there were 47,744 people living within the city.
* This article uses material from the Wikipedia article: Turda