Definition of "destrier"

I am resolved to share or avert the danger; which, that I may the better do, I would crave of thee the use of some palfrey whose pace may be softer than that of my destrier.

1820, Walter Scott, Ivanhoe; a Romance. […], volume III, Edinburgh: […] Archibald Constable and Co.; London: Hurst, Robinson, and Co. […], page 236

Dark and the Desert and Destriers me ken, And the Glaive and the Joust, and Paper and Pen.

1855, Al-Mutanabbi, translated by Richard Francis Burton, (Please provide the book title or journal name)