If Pope’s jurisdiction lies exclusively in Rome then how was he able to convene all of those ecumenical councils of bishops..
..They agree that only the bishop of Rome has the authority to convene an ecumenical council..
This was nonsense when you posted it in the other thread.
However, We can put this to the test.
The first council of the Church is recorded in Acts 15. With few exceptions, all of Christendom accepts this Council's decision. We don't know exactly who called for it, implications are it was Paul and Barnabas and it was presided over by James who was Bishop in Jerusalem. This does not fit your declaration above. In order to fit your model, it would have been Cephas/Peter who convoked the Council and/or presided over it. Neither is the case, yet we accept it.
Let's move on to the 7 Echumenical Councils accepted by the Eastern Orthodox Churches and by the Latin Church.
First Council of Nicaea (325) which was convoked by Emperor Constantine I and presided over by Hosius of Corduba. This is an important council and again, All of Christendom (with few exceptions) accept this council. It was neither convoked by nor presided over by a Pope of Rome, yet we accept it.
The First Council of Constantinople AD 381 this council was convened by Emperor Theodosius I and presided over by Timothy of Alexandria, Meletius of Antioch, Gregory Nazianzus, and Nectarius of Constantinople. Again, this does not fit your declaration that it must be called for by the Pope, yet we accept it.
The Council of Ephesus AD 431 called for by the Roman Emperor Theodosius II presided over by Cyril of Alexandria. This third ecumenical council confirmed the original Nicene Creed forbidding any additional change to it, condemned the teachings of Nestorius, differentiating Christotokos, "Christ-bearer" from the correct title Theotokos, "God-bearer" as a statement concerning the God-hood of Christ. Both the Catholic and Eastern Orthodox Churches accept this council but it does not fit your notion that only a Pope can call for it.
Council of Chalcedon 451 AD was the fourth ecumenical council. It was convoked by the Roman emperor Marcian. The Pope didn't even attend but it was presided over by Papal legates Paschasinus, Lucentius and Boniface. This one is a maybe in your column.
Second Council of Constantinople 553 is the fifth of the first seven ecumenical councils recognized by both the Eastern Orthodox Church and the Catholic Church. It was convoked by the Byzantine Emperor Justinian I under the presidency of Patriarch Eutychius of Constantinople — only sixteen Western bishops were present, including nine from Illyricum and seven from Africa, but none from Italy including the Pope. This is a definite nope toward your notion.
Third Council of Constantinople 680–681, counted as the Sixth Ecumenical Council by the Eastern Orthodox and Catholic Churches The patriarchs of Constantinople and of Antioch participated in person, whereas the patriarchates of Alexandria and Jerusalem were represented by Byzantine appointees (because of the Saracen Muslim conquest there was at this date no patriarch in either of these sees). The Pope and a council he had held in Rome were represented by a few priests and bishops.
Second Council of Nicaea AD 787 the last of the first seven ecumenical councils accepted by the Eastern Orthodox Church and the Catholic Church. Pope Adrian I was invited to participate, accepted, but did not attend sending an archbishop and an abbot as his legates. Which is contrary to your statement that the EO only accept those councils called for by the Pope.
That's the Seven Ecumenical Councils. It would be a stretch to say any of them fit beyond a maybe to your notion that only the Pope can call for them.
One of the reasons the EO do not accept later councils as being ecumenical is because Orthodoxy is honest enough to recognize that the Church is not unified as long as Rome remains in schism. Given all of Rome's errant children, the unification we all long for remains very difficult. That is, however, a far cry from your statement that only the Pope can call for an ecumenical council.