Niccolò de Columnis was a Genoese merchant and slaveholder active during the first half of the fifteenth century. He was born Niccolò Castagna and assumed the Columnis surname after entering into their albergo.
Niccolò de Marco was a slaveholder who was active in Genoa in the later fourteenth and early fifteenth century, where he held numerous administrative positions in the city and its eastern Mediterranean colonies.
Niccolò de Monelia was a silk merchant and slaveholder in Genoa during the first half of the fifteenth century where he held numerous administrative positions in government.