Sordello, a Provençal poet whom Dante and Virgil met in Purgatory sitting solitary and with a noble haughty mien, but who sprang up at sight of Virgil and embraced him and accompanied him a part of his way; Browning used his name, as the title of a poem showing the conflict a minister experiences in perfecting his craft.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Sorbonne * Sorel, Agnes