Assertion: alchemist's work | /r/HasProperty | written in 15th century
Facets:
value: by an influential alchemist
type: OTHER
Source sentences:
text: Like Newman’s, Principe’s immersion in the labyrinthine world of alchemy began in college, in his case in the early 1980s, after he read The Twelve Keys, an allegorical work written in the 15th century by an influential alchemist and supposed Benedictine monk, Basil Valentine.