A galley is a long ship. 

A galley is a long, thin ship. 

A galley is a special type of ship. It is built to move using oars. 
In the past, people used galleys for many jobs. They were used in wars to carry soldiers. They were also used for trade. Some galleys carried very expensive goods. They were even used to carry pilgrims on long trips. 
Ancient ships were named by their oars. A monoreme has one row of oars. A bireme has two rows. A trireme has three rows. Some very large ships were called polyremes. These had many rows of rowers. These ships were important in the Mediterranean Sea for a long time. They were used by the Greeks and the Romans. They were also used by the Phoenicians.
A galley is a special type of ship built to move using oars. 
To make a galley move, a large crew must work the oars.
People have used oared ships for thousands of years. 
Ancient sailors named their ships based on how many oars they had. 
Even though they were famous in the Mediterranean, galleys appeared in other places too. 
A galley is a specialized type of vessel optimized for propulsion by oars. 

The mechanics of a galley involve a complex relationship between the crew and the oars.
Ancient galleys were categorized by their rowing configurations. 
The history of the galley stretches back to the earliest watercraft. 
In combat, galleys were highly effective tools of war. 
Beyond war, galleys played a vital role in Mediterranean economy and travel. They served as trade vessels for expensive or high-priority goods until the end of the Middle Ages. Their oars guaranteed progress even when sailing ships were becalmed, or stuck without wind. This reliability made them a safe choice for transporting passengers. Christian pilgrims, in particular, used galleys for travel during the High and Late Middle Ages. However, galleys had clear limitations. They were unsuitable for the wide, open ocean and struggled in rough weather. They also required constant resupply from land-based stations.
Although the Mediterranean is their most famous home, the concept of the galley appeared elsewhere. 
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