Definition of "diadem"

And when the princely Perſean Diadem,Shall ouerweigh his wearie witleſſe head,And fall like mellowed fruit, with ſhakes of death,In faire Perſea noble TamburlainShall be my Regent, and remaine as King:

c. 1587–1588, [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire, London: Scolar Press, 1973, (please specify the page)

The fever’d diadem on my browI claim’d and won usurpingly ——Hath not the same fierce heirdom givenRome to the Caesar — this to me?

1829, Edgar Allan Poe, “Tamerlane”, in Al Aaraaf, Tamerlane and Minor Poems

The star of her destiny is the morning star of the new-born century. O’er the Golden Gate it glitters, diademming this youthful Queen of the Pacific in her robes of freedom gorgeously inlaid with gold.

1902, Horace G. Platt, “California”, in Harr Wagner, editor, Notable Speeches by Notable Speakers of the Greater West, San Francisco, Calif.: The Whitaker and Ray Company (Incorporated), page 215

Paul cites as an example the Macedonian churches and mentions specifically several things about their liberality which adorn their grace and crown it with beauty as the lily work diademmed the pillars of the Temple.

1920 January, G. J. Rousseau, “The Grace of Liberality”, in The Homiletic Review: An International Magazine of Religion, Theology, and Philosophy; Treats Every Phase of the Minister’s Work, volume LXXIX, number 1, New York, N.Y., London: Funk and Wagnalls Company, section “Sermonic Literature”, page 72, column 1

From many lands and from far distant climes have come great men and women to rest within our heart and to do great deeds and shape the noble events that have diademmed our crown with stars of splendor.

1921, Linwood Taft, “Historic Festival and Pageant”, in The Technique of Pageantry, New York, N.Y.: A. S. Barnes and Company, part II, page 143

butt (maomant scoffin, but apoxyomenously deturbaned but thems bleachin banes will be after making a bashman’s haloday out of the euphorious hagiohygiecynicism of his die and be diademmed).

1939 May 4, James Joyce, Finnegans Wake, London: Faber and Faber Limited; republished London: Faber & Faber Limited, 1960, part II, page 353

Vardan, brave champion [or, “martyr”] who routed the enemy, / You diademmed the Church in your rosy blood.

1987, The Armenian Review, page 6