E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Saccharissa.
A name bestowed by Waller on Lady Dorothea Sidney, eldest daughter of the Earl of Leicester, for whose hand he was an unsuccessful suitor, for she married the Earl of Sunderland.
1
The Earl of Leicester, father of Algernon Sidney, the patriot, and of Wallers Saccharissa built for himself a stately house at the north corner of a square plot of Lammas land belonging to the parish of St. Martins, which plot henceforth became known to Londoners as Leicester Fields.Cassells Magazine: London Legends, ii.
Saccharissa turns to Joan (Fenton: The Platonic Spell). The gloss of novelty being gone, that which was once thought unparalleled proves only ordinary. Fenton says before marriage many a woman seems a Saccharissa, faultless in make and wit, but scarcely is half Hymens taper wasted when the spell is dissolved, and Saccharissa turns to Joan.