La Princesa (also called Princesa, also known as Nuestra Señora del Rosario) was a Spanish frigate or corvette built at the Spanish Navy base at San Blas and launched in 1778. She is sometimes called a frigate and sometimes a corvette. At the time a corvette was similar to a frigate in that both were three-masted, ship-rigged warships, but corvettes were slightly smaller and had a single deck instead of two. The exact specifications of La Princesa are not known. La Princesa was designed with storage enough to sail for a year without having to restock. She was built for durability rather than speed. Like La Favorita, a similar corvette stationed at San Blas, La Princesa was heavily used, serving for over three decades, playing an important role in the exploration of the Pacific Northwest as