A title of honour, common with the old poets, as Dan Phoebus, Dan Cupid, Dan Neptune, Dan Chaucer, etc. (Spanish, don.)
Dan Chaucer, well of English undefiled, On Fame's eternal beadroll worthy to be filed.
Spenser: Faërie Queene, book iv. canto ii. 32.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894