Porolissum was an ancient Roman city in Dacia. Established as a military fort in 106 during Trajan's Dacian Wars, the city quickly grew through trade with the native Dacians and became the capital of the province Dacia Porolissensis in 124. It is one of the largest and best-preserved archaeological sites in modern-day Romania from the Roman Era. It is 8 km away from the modern city of Zalău, in Moigrad-Porolissum village, Mirsid Commune, Sălaj County.