legislator

lainsäätäjä, lainlaatija Someone who creates or enacts laws, especially a member of a legislative body.
(l)
c. 130-180 (C.E), w:Gaius (jurist)|Gaius, w:Gaius (jurist)The Institutes of Gaius|Institutiones, 3.76

nec me praeterit non satis in ea re legislatorem voluntatem suam verbis expressisse

: It has not escaped my observation, however, that the legislator did not express his intention in this manner in a way which is sufficiently clear.