The city of Teresina, the capital of the Brazilian state of Piauí, boasts a unique history that distinguishes it from most other administrative centres in the country. It was the first planned city in Brazil established not on the coast, but deep within the continent, a decision driven by strategic and economic considerations.
Foundation and early years. Teresina was officially founded on August 16, 1852, on the initiative of the provincial governor José Antônio Saraiva. Originally, the city was named Vila Nova do Poti, indicating its location by the Poti River, but later that same year, it was renamed Teresina in honour of Empress Teresa Cristina, the wife of the Brazilian Emperor Pedro II. The main reason for founding the new city was the necessity to move the capital from the old, inaccessible city of Oeiras, which was hindering the administrative and commercial development of the region.
Key factors in the city's establishment included several aspects. Firstly, a strategically advantageous geographical position at the confluence of two major rivers, the Parnaíba and the Poti, secured its role as an important river port. Secondly, the foundation of Teresina was the result of deliberate political will to create a modern and logically convenient administrative centre. Finally, the city was distinguished by a unique planned layout: unlike most Brazilian cities that grew chaotically, Teresina was built according to a clear plan resembling a chessboard.
Economic and cultural development began almost immediately. The city's economy was closely tied to river navigation and trade, which facilitated its rapid growth. Culturally, the city did not lag behind: numerous mango trees were planted along the streets, earning Teresina the nickname "Green City" (Cidade Verde). By the 19th century, significant architectural landmarks had already appeared here, such as the theatre in the Neoclassical style.