The Spanish Ship of the Line refers to a type of warship used by the Spanish Navy during the 17th to 19th centuries. These ships were designed for naval warfare and were typically armed with multiple decks of cannons. They played a crucial role in battles and were a key component of Spain's maritime power. These vessels were part of a broader category known as ships of the line, which were used by various navies around the world. The Spanish Navy utilized these ships to protect trade routes and engage in conflicts, particularly during the age of sail when naval dominance was vital for empires.