We visited the Colonna and Doria palaces, where the portraits of Beatrice were to be found, and her beauty cast the reflection of its own grace over her appalling story. Shelley's imagination became strongly excited, and he urged the subject to me as one fitted for a tragedy. More than ever I felt my incompetence; but I entreated him to write it instead; and he began, and proceeded swiftly, urged on by intense sympathy with the sufferings of the human beings whose passions, so long cold in the tomb, he revived and gifted with poetic language. This tragedy is the only one of his works that he communicated to me during its progress. We talked over the arrangement of the scenes together.

I am exceedingly interested in the question of whether this attempt of mine will succeed or no – I am strongly inclined to the affirmative at present, founding my hopes on this, that as a composition it is certainly not inferior to any of the modern plays that have been acted, with the exception of Remorse, that the interest of its plot is incredibly greater & more real, & that there is nothing beyond what the multitude are contented to believe they can understand, either in imagery opinion or sentiment.