Definition of "imaginator"

Secondly, hee would teach, that hee was as hee ſeemed to bee, true very man, fleſh, bloud, and bone as wee truely are; which the Divell denyed in the Docitæ [read Docetæ] or Imaginators, who held nothing reall, what hee [Christ] was, what hee did, what hee ſuffered, but all onely ſeeming ſo and in appearance.

1642, Richard Montagu, The Acts and Monuments of the Church Before Christ Incarnate, London: […] Miles Flesher and Robert Young, page 491

Suppose, if it be possible, that such a proposition had been made, or that such a prophecy had been ventured, in May 1834, as that in the spring of 1835 a Whig cabinet should be formed without thinking of Lord Brougham, and that some minor office should have been tossed to him, as you throw a bone to a dog! Would not the imaginator of such a thing have been treated as a maniac or a fool?

1835 May, “The State and Prospects of Toryism in May, 1835”, in Fraser’s Magazine for Town and Country, volume XI, London: James Fraser, […], page 612, column 2

We may add, and our author has knowledge of the fact, that not even the Germans, those masterly delineators and imaginators of fairy-land, have shown greater or more exquisite insight into the lives and ways of elfs and fays than that which was shown by George Cruikshank.

1882 October 7, “The Life of George Cruikshank: in Two Epochs. By Blanchard Jerrold. […]”, in The Athenæum: Journal of Literature, Science, the Fine Arts, Music, and the Drama, number 2867, London: […] John C. Francis, […], page 471, column 1

The musicological dancer and the historyteller inspired each other, sometimes in conspiracy also with Tessa the critical stage manager and Beni their imaginator of set and costumes.

1996, Jonathan Bayliss, Gloucestertide, Rockport, Mass.: Protean Press, page 260