Definition of "magnes"

Of mightie magnes stone

1590, Edmund Spenser, “Book II, Canto XII”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie

Magnes and many thinges attractive are, / But nothing ſo allective under ſkyes, / As that ſame dainty amiable ſtarre, / That none but griſly mouth of hell defyes.

1588, G[abriel] H[arvey], “[Greenes Memoriall; Or Certaine Funerall Sonnets.] Sonnet XVII. His Exhortation to Atonement and Love.”, in J[ohn] P[ayne] C[ollier], editor, Fovre Letters, and Certaine Sonnets, […] (Miscellaneous Tracts Temp. Eliz. & Jac. I), page 77