Ekenäs, known as Tammisaari in Finnish, was founded in 1546 under the directive of King Gustav Vasa of Sweden. The founding of this coastal town was part of a broader initiative to strengthen Sweden's territorial claims and enhance its economic stability in the region. Located in the Uusimaa region, Ekenäs was strategically positioned to facilitate trade and promote local settlement along the Baltic Sea. The establishment of the town was essential in offering protection against the threats posed by foreign powers, particularly highlighting the rising concerns regarding Russian expansionism during this period. Vasa's decision to found Ekenäs was indicative of his vision for a fortified and economically prosperous Sweden.

At its inception, Ekenäs was envisioned as a bustling hub that would not only support local commerce but also ensure the security of vital trade routes. The town was granted specific privileges to attract settlers, which included the right to self-governance and trade benefits. The settlement quickly developed its infrastructure, including market facilities, residences, and fortifications, to accommodate the growing population. Ekenäs became an important link between the interior of Finland and maritime trade routes, thus playing a crucial role in the economic landscape of 16th century Sweden.

Over the years, Ekenäs evolved into a vibrant community showcasing a blend of Swedish and Finnish cultures. The establishment of the town also prompted the development of local governance structures and community life that contributed to the region's stability and growth. As a result, Ekenäs grew beyond its initial purpose, becoming not only a center of trade but also a significant social and cultural hub in coastal Finland.