Plutarch lived most of his life at Chaeronea, and his duties as the senior of the two priests of Apollo at the Oracle of Delphi (where he was responsible for interpreting the auguries of the Pythia) apparently occupied little of his time. He led an active social and civic life while producing an extensive body of writing, much of which survived. By his writings and lectures Plutarch became a celebrity in the Roman Empire. At his country estate, guests from all over the empire congregated for serious conversation, presided over by Plutarch in his marble chair. Many of these dialogues were recorded and published, and the 78 essays and other works which have survived are now known collectively as the Moralia. Plutarch's Isis and Osiris is one of the most important historical documents on the myths and religion of the Egyptians.