I've been trying to find a complete outline of this online but yes...
The Synod of Elvira, A.D. 306, condemned the use of pictures in the churches...
So again which councels are right which fathers are right?
thank-you, I found it:
36. Pictures are not to be placed in churches, so that they do not become objects of worship and adoration.
here: http://www.stopthereligiousright.org/elvira.htm
the skopos has been bolded by me. Again, the differentiation between worship and veneration is clear.
As to your second question:
There are local, regional and ecumenical councils. I only know the EO, so my comments cannot be applied to western practice. The local councils produce canons (as the 81 at Elvira) which are pastoral responses to issues or problems arising in the local area. In this sense, they respond to the
local community - each arising from/existing in a particular region with a particular pre-existing language, secular culture, customs, etc.
The local council finds its narrow parallel in the relationship with the elder/geronta (discipleship - as in Timothy's relationship to Paul, Marks to Peter, and the known disciples of John in Asia Minor). On a personal level, my "spiritual father" may reccomend, in response to a particular spiritual struggle I am having, that I focus my reading on a particular book of the Bible, or read a particular ECF or monk, etc. Or my sf may reccomend that I give up TV (or the computer

) for a time as it may be compromising my spiritual development. Once the problem has resolved, I may return to watching TV, engage in less narrow spiritual readings, etc. if the problem has resolved.
The local canons act in the same way - they are interpreted/reccomended by the local bishop. They may go in and out of use in response to what is occuring at a particular time and place. Note also, that the local bishop is the sf of the parish priest.
There are also regional councils that act in the same way. The ecumenical councils more concern themselves with dangers that effect the
entire Church - as in the Arian heresy. They are attended by as many bishops as are able to attend. And they must be ratified by subsequent ecumenical council to be considered fully valid - not unlike the ratifying of the minutes of the previous meeting as "accepted" into the permanent record in "Roberts Rules of Order". Also note, at least in eastern practice, several previous councils are mentioned, tracing the history backwards to Christ.
The canons, teachings from the ecumenical councils apply to the entire Church, not just the local and regional communities. This same "tracing back" is often used in the ECFs, who will cite the last ECF on a theological point. The previous ECF will have cited an earlier ECF, etc -- and of course, they all reference the Bible and verbal teachings/practice.
In this sense, the local council is not the same as/does not have the same authority as the ecumenical council once the latter has been ratified. And the finding of the ecumenical council can "trump" local canon (though in practice, particular advice aimed at bringing someone "back into" truth may seem to temporarily look at odds - just a guess). As canons are never - as far as I know - "discarded" it becomes apparent that it is impossible to "enforce" all of them, again highlighting their
pastoral not legal character.