The Emperor visited Thessalonica to receive the homage in the infant's name, but was barred from the city by the bailiff Biandrate until he would agree to outrageous demands. Margaret, now in the Emperor's presence, put herself in his hands and revealed the plot against the infant.
The Emperor's visit to Thessalonica was motivated by his desire to receive tribute on behalf of the infant, but he was initially prevented from entering the city by bailiff Biandrate unless he would accept unacceptable demands. In this situation, Margaret took initiative and revealed the plot against the child in the Emperor's presence.