Chacón is known mainly for two of his works: Historia utriusque belli dacici a Traiano Caesare gesti (Rome, 1576), and Vitae, et res gestae pontificum romanorum et S.R.E.
Chacón was an expert on ancient Graeco-Roman and Paleo-Christian epigraphy, the Medieval paleography and manuscripts, besides the history of the papacy.
Or (gold) was designated by A (aurum), argent (silver) or white, respectively by a (argentum), azure (blue) with c (caeruleus), gules (red) by r (rubeus), and vert (green) by v (viridis).
The prophecy, including the attribution of the interpretations to Chacón, was first published in 1595 by Wion as part of his book Lignum Vitæ.
But this attribution to Chacón was refuted in 1694 by Claude-François Menestrier, who pointed out that the prophecies are never mentioned in the original 1601 edition of Chacón's Lives of the Popes and Cardinals, nor in the later editions of 1630 and 1677 that included much new material by later authors, and that neither were his alleged interpretations of the alleged prophecies mentioned as part of his works when they were very comprehensively listed (including his unpublished works) in both Nicolás Antonio's bibliography of Spanish writers, and Fr Ambroise de Altavera's bibliography of Dominican writers.