Here's the entry from the Oxford English Dictionary with its historical citations:
Noun
A person devoted to sensual pleasure, esp. to eating and drinking; a hedonist; a glutton. In later use also: a person who cultivates a refined taste for, or takes a particular pleasure in, fine food and drink; an epicure. In early use chiefly depreciative.
a1450 (▸c1435) J. Lydgate Life SS. Edmund & Fremund (Harl.) l. 225 in C. Horstmann Altengl. Legenden (1881) 2nd Ser. 381 (MED) Fals lust..of epicuriens.
a1475 (▸?a1430) J. Lydgate tr. G. Deguileville Pilgrimage Life Man (Vitell.) l. 12786 ‘I wolde se What Epicuriens sholde be.’..‘That perfyt ffelycyte Ys, that a man lyk hys delyt, ffolwe alway hys appetyt.’
a1572 J. Knox Hist. Reformation Scotl. (1587) 188 Simon Preaston..a right Epicurian.
a1652 J. Smith Select Disc. (1660) i. iii. 21 Those poor brutish Epicureans that have nothing but the meer husks of fleshly pleasure to feed themselves with.
1728 S. Whatley tr. J. Lenfant Hist. Council of Constance I. 577 Jerome was such an Epicurean in his Prison, that he spent his whole Time in Drunkenness and Gluttony.
1825 W. Scott Talisman x, in Tales Crusaders III. 250 He was a voluptuary and an epicurean.
1855 J. L. Motley Rise Dutch Republic I. ii. i. 256 A horde of lazy epicureans, telling beads and indulging themselves in luxurious vice.
1935 Washington Post 16 Oct. 5 There are a few real epicureans of the table.
2008 National Jeweler 1 Oct. 18 It [sc. chocolate] has become a bonbon for adults, to be savored by epicureans.
Adjective:
Originally: devoted to the pursuit of pleasure; (hence) hedonistic, gluttonous. Now chiefly: designating a person who takes a particular pleasure in fine food and drink; characteristic of, or suitable for, such a person; gourmet. Cf. epicure n. 2.
1583 W. Chauncie tr. P. Viret Worlde Possessed with Deuils ii. sig. F.vi Their Epicurian life [Fr. leur vie Epicurienne], giuen ouer to al filthinesse and enormitie.
1612 C. Demetrius tr. Most True Relation Earth-quake sig. B2v All at their plenteous and Epicurean voluptuous tables, fall to drinking, swilling, and carowsing deepe healths.
a1616 W. Shakespeare Antony & Cleopatra (1623) ii. i. 24 Epicurean Cookes, Sharpen with cloylesse sawce his Appetite.
1641 J. Milton Of Reformation 84 Warming their Palace Kitchins, and from thence their unctuous, and epicurean paunches.
1656 A. Cowley Misc. 37 in Poems Voluptuous, and Wise with all, Epicuraean Animal!
1750 Student 1 No. 6. 214 I'll be temperate, and stoutly withstand all the allurements of delicious fare, and the seducements of epicurean companions.
1765 Parasite II. xvii. 204 He dined at the Twopence Halfpenny Ordinary in Newgate Street (which we cannot suppose to have been a very Epicurean Meal).
1826 Monitor (Sydney) 15 Dec. 245/3 He who has fed upon corn for six-months, can eat a ‘fat cake’, with a true epicurean relish.
1850 T. Carlyle Latter-day Pamphlets vi. 15 No longer an earnest Nation, but a light, sceptical epicurean one.
1856 H. Penciller Rural Life in Amer. viii. 222 An epicurean fare we lived on, too.
1934 G. Ross Tips on Tables 37 An entree to delight any epicurean soul.
1954 Life 1 Feb. 44/2 Fancy preparing an epicurean feast so fast!
2008 IPA Rev. (Austral.) July 11/2 Slow food is not just an epicurean delight—it is a political and ideological movement.