Definition of "crowned"

Put case, he saith, all other medicines faile, by the helpe of God this alone will doe it, and tis a crowned medicine which must be kept in secret

1624, Democritus Junior [pseudonym; Robert Burton], “Preparatiues and purgers”, in The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps, partition 2, section 4, member 1

After having cloy'd his puny stomach, he sneaks away privily, in a Stage-Coach, to his house in the Country; there he murders the Vertuous Womb of his Dear Lady, and darts into the Royal Arch, his contagious, loathsome Sperm, which is innocently receiv'd, and hugg'd in the crown'd Act of Conception.

1699, Robert Barret, A Companion for Midwives, Child-Bearing Women, and Nurses., London, Sect. III, p. 96

More truly delightful to me the seduction-progress than the crowned act: for that's a vapour, a bubble!

1748, [Samuel Richardson], “Letter XXVII”, in Clarissa. Or, The History of a Young Lady: […], volume IV, London: […] S[amuel] Richardson; […]

Their crowned truths

1836, Emmeline Stuart-Wortley, Visionary: Canto III, v. cclxxxii.

That the crownèd truth advances.

1895, Ellen Maria Huntington Gates, The Treasures of Kurium