apostrophe to England and the recital of Norfolk's death. In the three chronicle histories just considered, although the historical material largely determines structure, tragic conception, and characterization, and although all these are obviously under Marlowe's influence, yet Shakespeare had reached a stage far more advanced than that of mere imitator or adapter. In "Richard III" he had added his own impress to the Marlowean type of tragedy, and in "Richard II" he had introduced innovations foreshadowing his later conceptions. As a playwright he had equaled any of his contemporaries in immediate popularity and outdone them in permanent theatrical effectiveness. He had acquired a complete mastery over the conditions and conventions of the stage, and had frequently, if not always, outdone the best of his rivals in dramatic ingenuity and power. Like his contemporaries, however, he was hampered by theatrical conditions and intractable historical material; and his chief interest was in the opportunities furnished by the chronicles for the delineation of character and the exercise of his gift of tongues. In range and verisimilitude his characters already far surpassed Marlowe's; and as a poet, whether in lyric, descriptive, or purely dramatic passages, whether in sustained treatment of situation or in splendid purple patches, he had shown himself the peer of his master. In "Romeo and Juliet" the same dramatic and poetic qualities are exhibited as in the historical plays, but the happy choice of the already well-known love story led Shakespeare outside of the direct range of Marlowe's example, freed him from the limits of the historical material, and gave his genius full scope. The importance of love as a motive in the Italian drama of the Renaissance is one of the traits that distinguish it from its classical models, and the influence of Italian drama and fiction was important in turning Elizabethan dramatists to stories of romantic passion. These had already been widely adopted in comedy and had formed the principle plots of "Tancred and Gismunda" and "Soliman and Perseda," as well as minor parts in other tragedies of the period. The story of Romeo and Juliet, which Brooke speaks of having seen "lately (1562) set forth on the stage with more commendation than I can look for," may have been made into an English play before Shakespeare was born.[17] It had at least been dramatized in France and Italy, where Luigi Groto's "Adriana" (1578) surpassed all contemporary plays in the number of its editions.