This book is dedicated to Einstein’s personal and scientific relationships with Italy, which began as early as adolescence and continued over various stages of his life. It collects together a wealth of historical documentation including the letters in which Einstein recalls having lived as a young man with his family in Lombardy, Pavia and Milan; the texts of three lectures delivered by Einstein in Italian in October 1921 in Bologna at the invitation of the mathematician Federigo Enriques, the only lectures he held in Italy; the correspondence with Enriques and other Italian intellectuals, together with the letter that Einstein sent in 1931 to the Minister of Justice Alfredo Rocco to try to avoid the infamy of the oath of allegiance to the fascist regime imposed by Mussolini on university professors. The book closes with some writings on relativity from 1907 to 1914 (Einstein, Abraham, Corbino, Castelnuovo) and the 1920s debate between pro-relativists and anti-relativists publishedin the international journal "Scientia", founded in 1907 by Enriques.