Question

But speak all good you can device of Caesar and say you do it by your permission who is been granted permission

Answer 1

Mark Antony is being granted permission by Marcus Brutus. After the assassination, when Antony went to make peace with the conspirators, he succeeded in winning Marcus Brutus's trust. Then he demanded permission to perform Caesar's funeral rites. Brutus granted the permission with certain conditions. However, Cassius was not in favor of it.