Where does “licitor” come from?

licitor (Latin) comes from Latin licitus, from Latin licet, from Proto-Italic *likēt.

Ancestry of “licitor”, step by step

Step	Language	Word	Meaning
1	Latin	licitus	allowed, permitted, having been permitted;...
2	Latin	licet	it is allowed; one is permitted; although, even...
3	Proto-Italic	*likēt	—

licitor — Etymology, Origin & Word History | Etymology Explorer