Short answers, pulled from the story.
Christopher Columbus was an Italian explorer and navigator from the Republic of Genoa, born sometime between the 25th of August and the 31st of October 1451. He completed four Spanish transatlantic voyages for the Catholic Monarchs and opened the way for European exploration and colonization of the Americas.
Christopher Columbus made landfall in the Americas on the 12th of October 1492, after departing Palos de la Frontera on the evening of the 3rd of August 1492. His landing place was a Bahamas island the native inhabitants called Guanahani, which he named San Salvador.
Christopher Columbus completed four round-trip voyages between Spain and the Americas between 1492 and 1504, each sponsored by the Crown of Castile. They reached the Caribbean, the South American mainland near the Orinoco in 1498, and the coast of Central America in 1502.
Christopher Columbus underestimated the size of the Earth by about a third by following Ptolemy's smaller figures and misreading an Arabic mile as the shorter mile of his own time. He estimated about 2,400 nautical miles from the Canary Islands to Japan, when the actual distance is more than 10,000.
Christopher Columbus was arrested in early October 1500 after accusations of brutality and tyranny as colonial governor of Hispaniola. The investigator Francisco de Bobadilla seized his property and sent him to Spain in chains aboard the caravel La Gorda, where he was jailed for six weeks before King Ferdinand ordered his release.
Christopher Columbus died in Valladolid on the 20th of May 1506, and his remains were moved repeatedly, including to Seville and to Santo Domingo. DNA testing in 2003 supported that remains in Seville Cathedral are his, while a lead box found in Santo Domingo in 1877 has never been allowed DNA testing.