If we define ecumenical pedigree properly, we would have to exclude all after our seven ecumenical councils. Indeed, a perfectionist could argue that the Council at Trullo could not be considered an ecumenical one.
However, I think that the issue of married bishops (or not) is a matter of discipline and practice and not of dogma. How could it be different as the Council of Trullo Canons 12 and 48 were departures from the Apostolic Canons and from Holy Scripture? They finessed it by merely requiring married bishops of that time not to live with their wives any longer (Canon 12) and requiring bishop candidates of the future to separate from their wives before consecration (Canon 48).
"And we say this, not to abolish and overthrow what things were established of old by Apostolic authority, but as caring for the health of the people and their advance to better things, and lest the ecclesiastical state should suffer any reproach." This excerpt from Canon 12 is referring to
a. Apostolic Canon 5--Let not a bishop, a priest, or a deacon cast off his own wife under pretence of piety; but if he does cast her off, let him be suspended. If he go on in it, let him be deprived," and perhaps to
b. St. Paul giving the qualifications of a bishop to St. Timothy in 1 Timothy 3:1-7--This is a true saying, if a man desire the office of a bishop, he desireth a good work. A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach; Not given to wine, no striker, not greedy of filthy lucre; but patient, not a brawler, not covetous; One that ruleth well his own house, having his children in subjection with all gravity; (For if a man know not how to rule his own house, how shall he take care of the church of God?) Not a novice, lest being lifted up with pride he fall into the condemnation of the devil. Moreover he must have a good report of them which are without; lest he fall into reproach and the snare of the devil.
c. The Lord speaking in Matthew 19:6--Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.
Now, it is clear that there is no canonical or biblical hindrance for married men to become bishops--they just cannot live with their wives. In practice, however, that only happens in the case of married priests, whose wives have separated from their husbands by passing on. Another custom that has arisen is for bishops to be monastics. I would appreciate for somebody to point out the reasons for this development beside speculation.