The city of Sumbe, located on Angola's Atlantic coast, has a rich colonial history. Its foundation stems from a decree by the Portuguese governor Francisco Inocêncio de Sousa Coutinho, who in 1769 ordered the establishment of a fortification at the mouth of the Cambongo-Negunza River. The settlement was named Novo Redondo, a name it held until 1975. The construction of a stone version of the fortress began in 1785, driven by strategic necessity: it served as a vital link between Luanda and Benguela and protected the coast from pirate raids. From its inception, the city became an important commercial hub. The name "Sumbe" itself is derived from the Kimbundu word "Kussumba," meaning "to buy," emphasizing its historical role as a center for the exchange of salt, fish, and European fabrics.
Over time, Novo Redondo grew not only as a trade center but also as an administrative one. A key milestone in its history occurred in 1955 when it attained the status of capital of Cuanza Sul Province, replacing Porto Amboim. The city's early economy was closely tied to its port status, later shifting its focus toward agriculture and the trade of local goods. The city's cultural heritage was shaped by significant Portuguese influence, which is still visible in its architecture today. For instance, the first church was built in 1811, and the first health service appeared in 1872. Notably, Novo Redondo became the first settlement in Angola to feature domestic electric lighting, powered by a local hydroelectric plant.