His chief work is his "History", in twenty-one books, of the period from 1118 to 1207. In spite of its florid style, it is of value as a record (on the whole impartial) of events to which he was either an eyewitness or which he had heard of first hand (though he should be balanced with the other Greek historian for this time, John Kinnamos). Its most interesting portion is the description of the occupation of Constantinople in 1204, which may be read with Geoffroi de Villehardouin's and Paolo Rannusio's works on the same subject.