A 20-year genetic investigation of the remains of Christopher Columbus has turned conventional historical wisdom on its head by concluding that the explorer whose voyage to the New World changed the course of global history may have been a Spanish Jew rather than a son of Genoa.

The claim raises the intriguing prospect that the man who played a central part in the creation of Spain’s mighty empire hailed from the very community that his patrons, King Ferdinand and Queen Isabella, expelled from their kingdom in the same year Columbus reached the Americas.

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José Antonio Lorente, a forensic medical expert at the University of Granada who has led the research, said his analysis had revealed that Columbus’s DNA was “compatible” with a Jewish origin.

“We have very partial, but sufficient, DNA from Christopher Columbus,” he said. “We have DNA from his son Fernando Colón, and in both the Y [male] chromosome and mitochondrial DNA [transmitted by the mother] of Fernando there are traces compatible with a Jewish origin.”