D. Diogo Ortiz de Villegas "Calzadilla" was a Spanish

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

 priest, theologian and astronomer at the service of the Portuguese monarchs. He was born in Calzadilla

Calzadilla

Calzadilla is a municipality located in the province of Cáceres, Extremadura, Spain. According to the 2006 census , the municipality has a population of 491 inhabitants....

, Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

, ca. 1457 and died in Almeirim

Almeirim

Almeirim is a city and a municipality in Portugal with a total area of 222.0 km² and a total population of 22,434 inhabitants. The city proper has a population of 10,520.The municipality is composed of 4 parishes, and is located in Santarém District....

 (Portugal

Portugal

Portugal , officially the Portuguese Republic is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the...

), in 1519.

Ortiz came to Portugal in 1476, accompanying Castilian Princess Joanna La Beltraneja. He became an adviser to King John II of Portugal

John II of Portugal

John II , the Perfect Prince , was the thirteenth king of Portugal and the Algarves...

 and later Manuel I

Manuel I of Portugal

Manuel I , the Fortunate , 14th king of Portugal and the Algarves was the son of Infante Ferdinand, Duke of Viseu, , by his wife, Infanta Beatrice of Portugal...

, being successively appointed Bishop of Tanger (1491–1500), Bishop of Ceuta

Ceuta

Ceuta is an autonomous city of Spain and an exclave located on the north coast of North Africa surrounded by Morocco. Separated from the Iberian peninsula by the Strait of Gibraltar, Ceuta lies on the border of the Mediterranean Sea and the Atlantic Ocean. Ceuta along with the other Spanish...

 (1500–1504) and Bishop of Viseu (1505–1519). During his rule, he led a comprehensive artistic remodelling of Viseu Cathedral

Viseu Cathedral

Viseu Cathedral is the bishopric seat of the city of Viseu, in Portugal. The church started being built in the 12th century and is the most important historical monument of the town...

.

Ortiz advised the Portuguese kings on matters related to astronomy

Astronomy

Astronomy is a natural science that deals with the study of celestial objects and phenomena that originate outside the atmosphere of Earth...

 and navigation

Navigation

Navigation is the process of monitoring and controlling the movement of a craft or vehicle from one place to another. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks...

 during the Age of Discovery

Age of Discovery

The Age of Discovery, also known as the Age of Exploration and the Great Navigations , was a period in history starting in the early 15th century and continuing into the early 17th century during which Europeans engaged in intensive exploration of the world, establishing direct contacts with...

. Manuel I named him tutor of his heir, future John III of Portugal

John III of Portugal

John III , nicknamed o Piedoso , was the fifteenth King of Portugal and the Algarves. He was the son of King Manuel I and Maria of Aragon, the third daughter of King Ferdinand II of Aragon and Queen Isabella I of Castile...

.

Ortiz taught on the writings of Cato

Cato the Elder

Marcus Porcius Cato was a Roman statesman, commonly referred to as Censorius , Sapiens , Priscus , or Major, Cato the Elder, or Cato the Censor, to distinguish him from his great-grandson, Cato the Younger.He came of an ancient Plebeian family who all were noted for some...

, Terence

Terence

Publius Terentius Afer , better known in English as Terence, was a playwright of the Roman Republic, of North African descent. His comedies were performed for the first time around 170–160 BC. Terentius Lucanus, a Roman senator, brought Terence to Rome as a slave, educated him and later on,...

, Virgil

Virgil

Publius Vergilius Maro, usually called Virgil or Vergil in English , was an ancient Roman poet of the Augustan period. He is known for three major works of Latin literature, the Eclogues , the Georgics, and the epic Aeneid...

, Sallust

Sallust

Gaius Sallustius Crispus, generally known simply as Sallust , a Roman historian, belonged to a well-known plebeian family, and was born at Amiternum in the country of the Sabines...

 and some parts of the Bible

Bible

The Bible refers to any one of the collections of the primary religious texts of Judaism and Christianity. There is no common version of the Bible, as the individual books , their contents and their order vary among denominations...

, the theory of the planets and some elementary matters about astrology he heard from Tomás de Torres

Tomás de Torres

Tomás de Torres was a Portuguese teacher of King John III of Portugal, an astrologer and an eminent doctor during the early 16th century in Portugal. He was satirized by Gil Vicente in one of his plays as Doctor Torres in the Auto dos Físicos...

, an eminent doctor and astrologer of that time.

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