Silence of the Council, after Some Words by the Bishop Eusebius
The bishop who occupied the chief place in the right division of the assembly then rose, and, addressing the emperor, delivered a concise speech, in a strain of thanksgiving to Almighty God on his behalf. When he had resumed his seat, silence ensued, and all regarded the emperor with fixed attention; on which he looked serenely round on the assembly with a cheerful aspect, and, having collected his thoughts, in a calm and gentle tone gave utterance to the following words.
Source: Life of Constantine (New Advent)