these were known as plaçage marriages
plaçage, n.
1. In 18th- and 19th-cent. Louisiana: the custom among many white men of setting up a black or mixed-race woman in her own household in addition to or in place of a wife.
2. In Haiti: a relationship similar to marriage but without religious sanction and conferring fewer legal rights upon the female partner, often polygynous and short-lived.










