Paroikoi

Paroikoi (plural of Greek πάροικος, paroikos, the etymological origin of parish and parochial) is the term that replaced "metic" in the Hellenistic and Roman period to designate foreign residents.^[1] In Asia Minor they were named katoikoi. In the Byzantine Empire, paroikoi were non-proprietary peasants, hereditary holders of their land, irremovable as long as they paid their rent.^[2] They appeared in the Justinian code, which prohibited this status; so it remained provisionally clandestine.

References

1. Encyclopedia of ancient Greece By Nigel Guy Wilson Page 470 ISBN 978-0-415-97334-2 (2006)
2. Encyclopedia of the Middle Ages, Part 114, Volume 1 By Adrian Walford Page 1091