Question: Who commanded the fleet of ships that included The San Juan de Sicilia?
Context: San Juan de Nicaragua Airport (Spanish: "Aeropuerto de San Juan de Nicaragua") (ICAO: MNSN) is an airport located in San Juan de Nicaragua, Río San Juan, Nicaragua.  The airport was built in 2012 at a cost of almost USD 17 million. The Church of San Juan Bautista de San Juan de Coquihuil (Spanish: "Iglesia de San Juan Bautista de San Juan de Coquihuil" ) is a Roman Catholic church located in the Chilean hamlet of San Juan, commune of Dalcahue in Chiloé Island.  Commonly referred to as «Church of San Juan» —Spanish: "Iglesia de San Juan" —, is within the Diocese of Ancud; its construction was finished around 1887. San Juan De Los Terreros is the easternmost village of Andalucía.  The coastal village has several bays and beaches nearby.  San Juan de los Terreros is a few miles along the coast south of Aguilas.  The area has supermarkets, chemist, restaurants, tapas bars, coffee shops, ice-cream parlours, and a medical centre.  It also has a nightclub during the summer months and a garden center.  An open market takes place during the summer each Sunday morning.  The small coves in San Juan de Los Terreros have traditional fishermen's cottages on the coastline.  A volcanic island, cliffs, and coves are located along the coast. María Izquierdo (October 30, 1902, San Juan de los Lagos – December 2, 1955, Mexico City) was a Mexican painter.  She was born María Cenobia Izquierdo Gutiérrez in San Juan de los Lagos in the state of Jalisco;.  After her father died, when she was five years old, she lived with her grandparents and aunt afterward in small towns of Aguascalientes, Torreón, and Saltillo.  Both her grandmother and aunt were devout Catholics and much of her upbringing revolved around daily Catholic traditions.  At age fourteen she had an arranged marriage to a senior army officer, Colonel Cándido Posadas, and bore three children by the time she was 17 years old.  In 1920 she and her family moved to Mexico City from San Juan de los Lagos where she first began to develop into a professional artist. Juan de Sanct Martín, also known as Juan de San Martín, was a Spanish conquistador.  Little is known about De Sanct Martín, apart from a passage in "El Carnero" (1638) by Juan Rodríguez Freyle and "Epítome de la conquista del Nuevo Reino de Granada", a work of uncertain authorship.  He took part in the expedition from Santa Marta into the Eastern Ranges of the Colombian Andes led by Gonzalo Jiménez de Quesada and founded Cuítiva, Boyacá in 1550.  Juan de Sanct Martín headed the left flank of the Spanish troops in the Battle of Tocarema against the Panche on August 20, 1538, while his fellow conquistador Juan de Céspedes commanded the right flank.  In this battle, Juan de Sanct Martín killed the "cacique" of the Panche and was hurt himself.  Juan de Sanct Martín had confronted the Panche the year before, when he was sent to the west while De Céspedes went south.  Due to the resistance of the bellicose Panche, De Sanct Martín returned to the Spanish camp. Colegio de San Juan de Letran (CSJL, Filipino: "Dalubhasaan ng San Juan de Letran" , colloquially, "Letran") is a Private Roman Catholic Dominican institution of learning located in Intramuros, Manila, in the Philippines.  The college was founded in 1620.  Colegio de San Juan de Letran has the distinction of being the oldest college in the Philippines and the oldest secondary institution in Asia.  It is owned and administered by the friars of the Order of Preachers (Dominicans) of the Philippine Dominican Province.  The school has produced Philippine presidents, revolutionary heroes, poets, legislators, members of the clergy, jurists, and it is also one of the only Philippine schools that has produced several Catholic saints who lived and studied on its campus.  The school's patron saint is St. John the Baptist while its patroness is Our Lady of the Most Holy Rosary.  The campus contains two statues, representing the two foremost alumni in the fields of secular and religious service: former Philippine President Manuel L. Quezon and Vietnamese Saint Vicente Liem de la Paz. San Juan de la Maguana is the capital municipality and the largest city in the province of San Juan, in the western region of the Dominican Republic.  It was one of the first cities founded on the island; founded in 1503 and was given the name of San Juan de la Maguana by San Juan Bautista and the Taino name of the valley: Maguana.  The term Maguana means "the first stone, the unique stone". The San Juan de Sicilia was one of the 130 ships that formed the ill-fated Spanish Armada of 1588.  The ship was originally known as the Brod Martolosi, before it was seized to form part of the navy.  It was one of 10 ships forming the Levant squadron, one of 8 squadrons that formed the entire armada. San Juan de Dios Park (in Spanish Colonias San Juan de Dios) (also known as "San Juan") is a zone situated in the south of Mexico City , in the delegation Tlalpan.  Has his origin in the Inland revenue of San Juan of God "The Big".  The zone is conformed by the colonies Hacienda de San Juan, Villa Lázaro Cárdenas,Ex Hacienda San Juan de Dios, Arboledas Del Sur, Hacienda de San Juan 2nd Section, Chimalli, The Colorines, Guadeloupe Tlalpan and the colony AMSA.  The zone houses big number of parks scattered in all his colonies as well as it also has commercial squares like the shopping centre Paseo Acoxpa.  Also the zone of San Juan basin with different urban services like transport, educational and of health.  San Juan of God is a residential zone mostly, has different private residentials and also private or private streets.  Many of his colonies also belong to the zone of Coapa. The Spanish Armada (Spanish: "Grande y Felicísima Armada" , literally "Great and Most Fortunate Navy") was a Spanish fleet of 130 ships that sailed from La Coruña in August 1588, under the command of the Duke of Medina Sidonia with the purpose of escorting an army from Flanders to invade England.  The strategic aim was to overthrow Queen Elizabeth I and her establishment of Protestantism in England, with the expectation that this would put a stop to English interference in the Spanish Netherlands and to the harm caused to Spanish interests by English and Dutch privateering.
Answer: Duke of Medina Sidonia