On May 12, 1571, the Royal Audience (Real Audiencia) of Santo Domingo authorized that both the populations of San Germán and Santa María de Guadianilla be merged into a single city due to the constant French attacks. The new city was built on the Hills of Santa Marta, next to the Guanajibo River in 1573. Its official name was Nueva Villa de Salamanca, named after the city of Salamanca in Spain. However, the population called the city San Germán el Nuevo (New San Germán) and, eventually, the Villa de San Germán (City of San Germán).