They had taken to the trade, and, when no longer able to carry it on in a quasi-legitimate manner, did so on their own lines.
mid-15c., "lawfully begotten," from Middle French legitimer and directly from Medieval Latin legitimatus, past participle of legitimare "make lawful, declare to be lawful," from Latin legitimus "lawful," originally "fixed by law, in line with the law," from lex (genitive legis) "law" (see legal). Transferred sense of "genuine, real" is attested from 1550s. Related: Legitimately.
1590s, from Medieval Latin legitimatus, past participle of legitimare (see legitimate (adj.)). Related: Legitimated; legitimating.