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In page Council of Chalcedon:

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The situation continued to deteriorate, with Leo demanding the convocation of a new council and Emperor Theodosius II refusing to budge, all the while appointing bishops in agreement with Dioscorus. All this changed dramatically with the Emperor's death and the elevation of Marcian to the imperial throne. To resolve the simmering tensions, Marcian announced his intention to hold a new council to set aside the 449 Second Council of Ephesus which was named the "Latrocinium"[1] or "Robber Council" by Pope Leo. Pulcheria, the sister of Theodosius, may have influenced this decision, or even made the convention of a council a requirement during her negotiations with Aspar, the magister militum, to marry Marcian.[citation needed]