E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Questa Gentilissima (Italian).
Most gentle one, a love term used by Dante to Beatrice
1
Common mortals stand and gaze with bated breath while that most gentle one (questa gentilissima) goes on her wayMrs. Oliphant: Makers of Florence, p. 25.