"The drama was the branch of literature which peculiarly signalised the age of Pericles; and it belongs to the political, no less than to the literary, history of these times, and deserves to be considered in both points of view. The steps by which it was brought through a series of innovations to the form which it presents in its earliest extant remains, are still a subject of controversy among antiquarians; and even the poetical character of the authors by whom these changes were effected, and of their works, is involved in great uncertainty. We have reason to believe that it was no want of merit, or of absolute worth, which caused them to be neglected and forgotten, but only the superior attraction of the form which the drama finally assumed. Of Phrynichus in particular, the immediate predecessor of Aeschylus, we are led to conceive a very favourable opinion, both by the manner in which he is mentioned by the ancients who were acquainted with his poems, and by the effect which it is recorded to have produced upon his audience. It is clear that Aeschylus, who found him in undisputed possession of the public favour, regarded him as a worthy rival, and was in part stimulated by emulation to unfold the capacities of their common art by a variety of new inventions. These, however, were so important as to entitle their author to be considered as the father of Attic tragedy. This title he would have deserved, if he had only introduced the dialogue, which distinguished his drama from that of the preceding poets, who had told the story of each piece in a series of monologues. So long as this was the case, the lyrical part must have created the chief interest; and the difference between the Attic tragedy and the choral songs which were exhibited in a similar manner in the Dorian cities was perhaps not so striking as their agreement. The innovation made by Aeschylus altered the whole character of the poem; raised the purely dramatic portion from a subordinate to the principal rank, and expanded it into a richly varied and well organised composition. With him, it would seem, and as a natural consequence of this great change, arose the usage, which to us appears so singular, of exhibiting what was sometimes called a trilogy, which comprised three distinct tragedies at the same time." Grote says:--