The name Christopher Columbus is the Anglicisation of the Latin Christophorus Columbus. His name in Ligurian is Cristoffa Corombo, in Italian Cristoforo Colombo, in Spanish Cristóbal Colón, and in Portuguese, Cristóvão Colombo. He was born before 31 October 1451 in the territory of the Republic of Genoa (now part of modern Italy), though the exact location remains disputed.[b] His father was Domenico Colombo, a middle-class wool weaver who worked both in Genoa and Savona and who also owned a cheese stand at which young Christopher worked as a helper. His mother was Susanna Fontanarossa. He had three brothers, Bartolomeo, Giovanni Pellegrino, and Giacomo . He also had a sister named Bianchinetta. His brother Bartolomeo worked in a cartography workshop in Lisbon for at least part of his adulthood.
Columbus never wrote in his native language, which is presumed to have been a Genoese variety of Ligurian: his name in the 16th-century Genoese language would have been Cristoffa Corombo (Ligurian pronunciation: [kriˈʃtɔffa kuˈɹuŋbu]). In one of his writings, he says he went to sea at the age of 10. In 1470, the Columbus family moved to Savona, where Domenico took over a tavern. In the same year, Christopher was on a Genoese ship hired in the service of René of Anjou to support his attempt to conquer the Kingdom of Naples. Some modern authors have argued that he was not from Genoa but, instead, from the Aragon region of Spain or from Portugal. These competing hypotheses have generally been discounted by mainstream scholars.
In 1473, Columbus began his apprenticeship as business agent for the important
Di Negro and Spinola families of Genoa. Later, he allegedly made a trip to Chios, an Aegean island then ruled by Genoa. In May 1476, he took part in an armed convoy sent by Genoa to carry valuable cargo to northern Europe. He docked in Bristol, England and Galway, Ireland. A few writers speculate that in 1477, he was in Iceland. It is known that in the autumn of 1477, he sailed on a Portuguese ship from Galway to Lisbon, where he found his brother Bartolomeo, and they continued trading for the Centurione family. Columbus based himself in Lisbon from 1477 to 1485. He married Filipa Moniz Perestrelo, daughter of the Porto Santo governor and Portuguese nobleman of Lombard origin Bartolomeu Perestrello.
In 1479 or 1480, his son Diego Columbus was born. Between 1482 and 1485, Columbus traded along the coasts of West Africa, reaching the Portuguese trading post of Elmina at the Guinea coast (in present-day Ghana). Some records report that Filipa died sometime around 1485, while Columbus was away in Castile. He returned to Portugal to settle her estate and take his son Diego with him. He had left Portugal for Castile in 1485, where he found a mistress in 1487, a 20-year-old orphan named Beatriz Enríquez de Arana. It is likely that Beatriz met Columbus when he was in Córdoba, a gathering site of many Genoese merchants and where the court of the Catholic Monarchs was located at intervals. Beatriz, unmarried at the time, gave birth to Columbus's natural son Fernando Columbus in July 1488, named for the monarch of Aragón. Columbus recognized the boy as his offspring. Columbus entrusted his older, legitimate son Diego to take care of Beatriz and pay the pension set aside for her following his death, but Diego was negligent in his duties.
Ambitious, Columbus eventually learned Latin, Portuguese, and Castilian. He read widely about astronomy, geography, and history, including the works of Claudius Ptolemy, Cardinal Pierre d'Ailly's Imago Mundi, the travels of Marco Polo and Sir John Mandeville, Pliny's Natural History, and Pope Pius II's
Historia Rerum Ubique Gestarum. According to historian Edmund Morgan,
Columbus was not a scholarly man. Yet he studied these books, made hundreds of marginal notations in them and came out with ideas about the world that were characteristically simple and strong and sometimes wrong, ...
Throughout his life, Columbus also showed a keen interest in the Bible and in Biblical prophecies, often quoting biblical texts in his letters and logs. For example, part of the argument that he submitted to the Spanish Catholic Monarchs when he sought their support for his proposed expedition to reach the Indies by sailing west was based on his reading of the Second Book of Esdras (Ezra): see 2 Esdras 6:42, which he took to mean that the Earth is made of six parts of land to one of water. Towards the end of his life, he produced a Book of Prophecies in which his career as an explorer is interpreted in the light of Christian eschatology and of apocalypticism.
Carol Delaney has argued that Columbus was a millenialist and that these beliefs motivated his quest for Asia in a variety of ways. Columbus wrote often about seeking gold in the diaries of his voyages and writes about acquiring the precious metal “in such quantity that the sovereigns…will undertake and prepare to go conquer the Holy Sepulcher”  Comparative Studies in Society and History. April, 2006. . In an account of his fourth voyage, Columbus wrote that “Jerusalem and Mount Sion must be rebuilt by Christian hands” . It has also been written that “conversion of all people to the Christian faith” is a central theme in Columbus’s writings which is a central tenant of some Millenarian beliefs. In a more specific identification of his motivations, Hamandi writes that the “deliverance of Jerusalem from Muslim hands” could be accomplished by “using the resources of newly discovered lands”.