The term "galleon" was originally applied to certain types of war galleys in the Middle Ages. The Annali Genovesi mentions galleons of 80, 64 and 60 oars, used for battle and on missions of exploration, in the 12th and 13th centuries. It is very likely that the galleons and galliots mentioned in the accounts of the crusades were the same vessels. Later, when the term started to be applied to sail only vessels, it meant, like the English term "man of war", a warship that was otherwise no different from the other sailing ships of the time.
The galleon was an ocean going ship type which evolved from the carrack in the second half of 16th century. A lowering of the forecastle and elongation of the hull gave galleons an unprecedented level of stability in the water, and reduced wind resistance at the front, leading to a faster, more maneuverable vessel. The galleon differed from the older types primarily by being longer, lower and narrower, with a square tuck stern instead of a round tuck, and by having a snout or head projecting forward from the bows below the level of the forecastle. In Portugal at least, carracks were usually very large ships for their time (often over 1000 tons), while galleons were mostly under 500 tons, although the Manila galleons were to reach up to 2000 tons. With the introduction of the galleon in Portuguese India Armadas during the first quarter of the 16th century, carracks gradually began to be less armed and became almost exclusively cargo ships (which is why the Portuguese Carracks were pushed to such large sizes), leaving any fighting to be done to the galleons. One of the largest and most famous of Portuguese galleons was the São João Baptista (nicknamed Botafogo, 'spitfire'), a 1,000-ton galleon built in 1534, said to have carried 366 guns. Carracks also tended to be lightly armed and used for transporting cargo in all the fleets of other Western European states, while galleons were purpose-built warships, and were stronger, more heavily armed, and also cheaper to build (5 galleons could cost around the same as 3 carracks) and were therefore a much better investment for use as warships or transports. There are disputes about its origins and development but each Atlantic sea power built types suited to its needs, while constantly learning from their rivals. It was the captains of the Spanish navy Pedro Menéndez de Avilés and Álvaro de Bazán who designed the definitive long and relatively narrow hulled galleon in the 1550s.
The galleon was powered entirely by wind, using sails carried on three or four masts, with a lateen sail continuing to be used on the last (usually third and fourth) masts. They were used in both military and trade applications, most famously in the Spanish treasure fleet, and the Manila Galleons. While carracks played the leading role in early global explorations, galleons also played a part in the 16th and 17th centuries. In fact, galleons were so versatile that a single vessel may have been refitted for wartime and peacetime roles several times during its lifespan. The galleon was the prototype of all square rigged ships with three or more masts for over two and a half centuries, including the later full rigged ship.
The principal warships of the opposing English and Spanish fleets in the 1588 confrontation of the Spanish Armada were galleons, with the modified English "race built" galleons developed by John Hawkins proving decisive, while the capacious Spanish galleons, designed primarily as transports, showed great endurance in the battles and in the great storms on the voyage home; most survived the ordeal.
Galleons were constructed from oak (for the keel), pine (for the masts) and various hardwoods for hull and decking. Hulls were usually carvel-built. The expenses involved in galleon construction were enormous. Hundreds of expert tradesmen (including carpenters, pitch-melters, blacksmiths, coopers, shipwrights, etc.) worked day and night for months before a galleon was seaworthy. To cover the expense, galleons were often funded by groups of wealthy businessmen who pooled resources for a new ship. Therefore, most galleons were originally consigned for trade, although those captured by rival states were usually put into military service.
Because of the long periods often spent at sea and poor conditions on board, many of the crew sometimes perished during the voyage; therefore advanced rigging systems were developed so that the vessel could be sailed home by an active sailing crew a fraction of the size aboard at departure.
Distinguishing features 
The most distinguishing features of the galleon include the long beak, the lateen-rigged mizzenmasts, and the square gallery at the stern off the captain's cabin. In larger galleons, a fourth mast was added, usually a lateen-rigged mizzen, called the bonaventure mizzen.
The galleon continued to be used into the 18th century, by which time purpose-built vessels such as the fluyt, the brig and the full rigged ship, both as a trading vessel and ship of the line, rendered it obsolete for trade and warfare respectively.
The oldest English drawings 
The oldest known scale drawings in England are in a manuscript called "Fragments of Ancient Shipwrightry" made in about 1586 by Mathew Baker, a master-shipwright. This manuscript, held at the Pepysian Library, Magdalene College, Cambridge, provides an authentic reference for the size and shape of typical English galleons built during this period. Based on these plans, the Science Museum, London has built a 1:48 scale model ship that is an exemplar of galleons of this era.
Notable galleons 
- São João Baptista nicknamed Botafogo, the most powerful warship when launched (1534) by the Portuguese; became famous during the conquest of Tunis, where it was commanded by Infante Luís, Duke of Beja.
- Adler von Lübeck the largest ship of its day when launched in 1566.
- The Manila galleons, Spanish trading ships that sailed once or twice per year across the Pacific Ocean between Manila in the Philippines and Acapulco in New Spain (now Mexico); (1565 - 1815).
- San Salvador, flagship vessel in the João Rodrigues Cabrilho's 1542 exploration of present day California in the United States.
- San Pelayo, the large 906-ton galleon which served as the flagship of Pedro Menéndez de Avilés during his expedition to establish St. Augustine, Florida in 1565. Ironically, the vessel was so large it could not enter St. Augustine's harbor, so Menendez ordered it offloaded and sent it back to Hispaniola. At a later date her crew mutinied and sailed to Europe where the ship wrecked off the coast of Denmark.
- Golden Hind, the ship in which Sir Francis Drake circumnavigated the globe 1577 -1580
- Ark Raleigh, the ship was designed and built by Sir Walter Raleigh. It was later chosen by Lord Howard, admiral of the fleet to be the flagship of the English fleet in the fight against the Spanish Armada in 1588 and was summarily renamed the Ark Royal.
- Revenge, a galleon built in 1577, the flagship of Sir Francis Drake in the Battle of the Spanish Armada in 1588, was captured by a Spanish fleet off Flores in the Azores in 1591 and sank while being sailed back to Spain.
- São Martinho, the Portuguese galleon, the flagship of Duke of Medina Sidonia, commander-in-chief of the Spanish Armada.
- Triumph, the largest Elizabethan galleon; flagship of Sir Martin Frobisher in the Battle of the Spanish Armada
- San Juan Bautista (originally called Date Maru, 伊達丸 in Japanese). She crossed the Pacific Ocean from Japan to New Spain in 1614. She was of the Spanish galleon type, known in Japan as Nanban-Sen (南蛮船).
- Nuestra Señora de la Concepción, a Spanish Galleon, known to its crew as Cacafuego for its strong cannon. It was captured by Sir Francis Drake in 1578 and all its treasures were brought to England. It was holding treasures mined in one year by the Spanish in the Americas.
- Padre Eterno, a Portuguese galleon launched in 1663. It was considered to be the biggest ship of its time, carrying 144 pieces of artillery and able to carry up to 2.000t of cargo.
- Vasa (ship), the only original galleon to be preserved. It sank in 1628 and was raised in 1961 for preservation as a museum ship.
See also 
-  Os Navios e as Técnicas Náuticas Atlânticas nos Séculos XV e XVI: Os Pilares da Estratégia 3C - Rear Admiral Antonio Silva Ribeiro - Revista Militar (in portuguese)
-  Galeão - Navegações Portuguesas by Francisco Contente Domingues (in portuguese)
- "The galleon evolved in response to Spain's need for an ocean-crossing cargo ship that could beat off corsairs. Pedro de Menéndez, along with Álvaro de Bazán (hero of Lepanto), is credited with developing the protypes which had the long hull - and sometimes the oars - of a galley married to the poop and prow of a nao or merchantman. Galeones were classed as 1-, 2- or 3-deckers, and stepped two or more masts rigged with square sails and topsails (except for a lateen sail on the mizzenmast). Capacity ranged up to 900 tons or more. Menéndez' San Pelayo of 1565 was a 900 ton galleon which was also called a nao and galeaza. She carried 77 crewmen, 18 gunners, transported 317 soldiers and 26 families, as well as provisions and cargo. Her armament was iron."p.100 Menéndez: Pedro Menéndez de Avilés, Captain General of the Ocean Sea Albert C. Manucy, published 1992 by Pineapple Press, Inc
- Walton, Timothy R. (2002).The Spanish Treasure Fleets. Pineapple Press Inc, p. 57. ISBN 1-56164-261-4
- Fragments of Ancient English Shipwrightry
- Little, Benerson (2010). "Spanish Galleons and Portuguese Carracks". Pirate Hunting: The Fight Against Pirates, Privateers, and Sea Raiders from Antiquity to the Present. Washington, DC: Potomac. p. 145. ISBN 978-1-59797-291-8. "Called by her crew Cacafuego... fire shitter"
- Alertz, U. (1991) Vom Schiffbauhandwerk zur Schiffbautechnik : die Entwicklung neuer Entwurfs- und Konstruktionsmethoden im italienischen Galeerenbau (1400-1700), Hamburg : Kovač, ISBN 3-925630-56-2
- Humble, R. and Bergin, M. (1993) A 16th century galleon, Inside story series, Hemel Hempstead : Simon & Schuster, ISBN 0-7500-1339-7
- Kirsch, P. (1990) The Galleon: the great ships of the Armada era, London : Conway Maritime, ISBN 0-85177-546-2
- Rutland, J. (1988) A galleon, 2nd rev. ed., Connaty, M. (ed.), London : Kingfisher, ISBN 0-86272-327-2
- Serrano Mangas, F. (1992) Función y evolución del galeón en la carrera de Indias, Colección Mar y América 9, Madrid : Editorial MAPFRE, ISBN 84-7100-285-X
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