What is another word for "custos"?

Roget's Thesaurus (1911) lists these synonyms for "custos": amanuensis, and, annalist, antiquary, antiquity, ayah, babu, biographer, bodyguard, bonne, bookkeeper, castellan, chronicler, clerk, coast, concierge, costa, custodian, duenna, escort, game, gaoler, governess, governor, guard, guardian, hayward, historian, historiographer, interviewer, jailer, journalist, keeper, memorialist, nanny, narrator, notary, nurse, protector, prothonotary.