Definition of "Shakesperian"

I could have spoken in blank verse of Shakesperian beauty, all sorts of great ideas flashed through my mind; it was as though the bonds of my flesh had been loosened and left the spirit free to soar to the empyrean of its native power.

1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887