If I may rephrase my question a little, I was wondering if the Romans, living by the Julian Calendar, had a concept of their months being broken down into smaller portions?
I have read about the Roman Calendar having designated days of the month called Fasti that were seen as specific days that were thought of as suitable to hold assemblies/festivals/whatever those people were up to. But I couldn't find much about it regarding the Julian Calendar.
So here's my question: Were Roman months broken down into smaller, repetitive cycle of weeks?
The pre-Christian Romans had an eight-day cycle of nundinae or ninth-days (counted inclusively) that had some importance as a market cycle. The degree of its cultural relevance is somewhat debated (see for example this article, but almost certainly did not have the same depth of cultural import as the modern week, which has its roots via the Church in the seven-day religious cycle of Judaism.
Edit -- switched out bolds for italics, not sure what I was doing the first time around.
hi! you'll find a few references to weeks in ancient Rome in this section of the FAQ*
*see the link on the sidebar or the wiki tab