His administration was mainly concerned with building fortifications, including the Castillo de San Marcos, which his predecessors began to defend La Florida against British and French attacks by land and water.
[1] That same month (August, 1687), eleven escaped African slaves from the Province of Carolina, including an infant, arrived by boat at the Franciscan Mission of Santa María de Sena on present-day Amelia Island in Florida, seeking a better life.
[4] Quiroga ordered the construction of Fort Apalachicola without seeking the King's permission, "because English traders had begun to settle and conduct business with local Native American groups immediately north of Spanish missions".
[4] In 1690, Quiroga y Losada began selling coquina from the royal quarry on Anastasia Island to the garrison soldiers and the other townspeople for building houses or other structures.
The inhabitants approved his proposal and started to build the wall with two thousand dollars donated by the local soldiers, who were themselves owed back pay.