Definition of "authentical"

He graunted it: and streight his warrant made, / Under the Sea-gods seale autenticall […].

1596, Edmund Spenser, “Book IV, Canto XII”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie

The curious and exact care he had of his body, is an authenticall witnesse of it, forsomuch as he used the most lascivious meanes that then were in use […].

1603, Michel de Montaigne, chapter 33, in John Florio, transl., The Essayes […], book II, London: […] Val[entine] Simmes for Edward Blount […]

The Holie Bible faithfully translated into English, out of the authentical Latin.

1609, Douay–Rheims Bible, title page