In 1510, Spaniards founded Santa María la Antigua del Darién near the Gulf of Urabá. It became the first durable Spanish base on the American mainland and the first capital of the region later called Castilla del Oro. From here, Spanish leaders organized expeditions, alliances, and raids that reshaped control of the Central American isthmus.
In 1513, the Spanish Crown made “Castilla del Oro” an official name for its mainland holdings around the isthmus. The change signaled a shift from exploratory outposts toward formal imperial administration. It also set the stage for appointing a royal governor with broad powers over settlement and conquest.
In September 1513, Vasco Núñez de Balboa led an expedition across the isthmus and became the first European known to have seen the Pacific from the Americas. He then claimed the “South Sea” for the Spanish Crown. This discovery increased the strategic value of Panama as the shortest land bridge between the Atlantic and Pacific worlds.
In 1514, Pedro Arias Dávila (“Pedrarias”) arrived with a large expedition and took control as governor. His arrival marked a turn toward aggressive conquest, forced labor, and tighter royal oversight. Political conflict between Pedrarias and Balboa soon destabilized the early colony but did not stop Spanish expansion from the isthmus.
In 1515, the town of Acla was founded on the Caribbean side of the isthmus under Pedrarias’s orders. It was intended to support travel and transport across Panama and to strengthen Spanish control of coastal routes. Acla later became infamous as a site where political power struggles were decided by force.
In January 1519, Vasco Núñez de Balboa was tried and executed at Acla on the orders of Pedrarias. The execution removed a rival leader and warned other captains against acting independently. It also reinforced the governor’s authority over exploration plans and resources in the isthmus.
On August 15, 1519, Pedrarias founded Panama City (Nuestra Señora de la Asunción de Panamá) on the Pacific shore. The new city quickly became the main Spanish base for Pacific exploration and a key transit point for moving people and wealth across the isthmus. This shift began to pull population and power away from the earlier Darién settlement.
Between 1522 and 1523, an expedition led by Gil González Dávila and Andrés Niño explored parts of the Pacific coast north of Panama, reaching areas of present-day Costa Rica and Nicaragua. The voyage gathered information on routes, peoples, and resources and brought back significant amounts of gold. It also showed that conquest and colonization were expanding from Panama into the wider Central American isthmus.
In 1522, Spanish authorities founded Natá to strengthen control of fertile interior lands and support settlement beyond the coast. As a farming and supply center, it helped sustain Panama City and expeditions moving through the region. Natá also sat near areas where Indigenous leaders resisted Spanish demands for labor and tribute.
In 1524, Francisco Hernández de Córdoba—operating under Pedrarias’s authority—founded the colonial cities of Granada and León in present-day Nicaragua. These towns anchored Spanish power further north and linked Nicaragua more closely to Panama’s leadership and supply routes. Their founding marked a move from raiding expeditions toward permanent colonization on the isthmus’s Pacific side.
By 1524, the Spanish administration shifted decisively away from Darién, and Santa María la Antigua del Darién was abandoned as the capital and settlement. This transition reflected the rise of Panama City as the main hub connecting Atlantic and Pacific operations. The abandonment also shows how Spanish colonization often relocated to sites that better supported trade, shipping, and centralized control.
On February 26, 1538, the Spanish Crown created the Real Audiencia of Panama, a high court that also served as a major governing institution. This step helped standardize administration, resolve disputes, and enforce royal policy across a very large region. It marks a late-stage shift in the 1513–1540 story: from conquest led by captains to more formal colonial government based in Panama City.
Spanish conquest and colonization of Panama and the Central American isthmus (1513–1540)