The history of Porto, one of the oldest cities in Europe, dates back to ancient times. The first settlements in this territory, founded by Celtic tribes, date back to approximately the 3rd century BC. However, the key moment in the city's formation came with the arrival of the Romans in 136 BC. It was they who founded a port settlement on the hills at the mouth of the Douro River, which was named Portus Cale. Over time, this name transformed and gave its name not only to the city but to the entire country — Portugal.
The rise of Porto as an important centre was predetermined by several key factors. Firstly, its strategic geographical location at the mouth of the Douro River, flowing into the Atlantic Ocean, made it a natural port and gateway for maritime trade. Secondly, the city played a significant role during the Reconquista, changing hands until 1095, when it became the centre of the newly formed County of Portugal (Condado Portucalense), which formed the basis of the future kingdom. This political status cemented its importance in the region.
From the very beginning, Porto's economy and culture were inextricably linked to trade and navigation. By the 13th-14th centuries, the city had established active maritime trade relations with England, Flanders, and other European countries. Porto gained particular fame and economic prosperity through the wine trade, especially after the signing of the Methuen Treaty with England in 1703, which opened the British market to Portuguese wines. It was then that the production of the world-famous Port wine, which became a symbol of the city, began. The early culture of Porto was distinguished by the independence and enterprising spirit of its inhabitants — until the 17th century, there was a law prohibiting aristocrats from building palaces within the city limits.