In the sociology of religion, secondary conversion is the religious conversion of an individual that results from a pre-existing relationship with another convert, rather than any particular aspect of the new religion. For example, someone might join a religious group primarily because their spouse or partner has done so; such a person would be a secondary convert. Secondary converts are people who join a religion only because of a relationship with the other convert.
Secondary conversion can greatly expand a religion's influence particularly after a conquest, such a the Moorish Conquest of Spain and Spain's conquests in Latin America.
