Cosmo de Lazarino was a slaveholder and citizen of Genoa who was active in the late fourteenth century and early fifteenth century.
Cosme de Lazarino civi Ianue quondam Antonii
Giuliano Canella, register 5, 1415–1417, fol. 24r–v
Branca Bagnara, filza 19, series III, nr. 111a