4 Which he by many rash adventures won, 5 Since errant arms to sue he first began;

errant arms > [feats of arms performed by a knight errant] sue > {Pursue, go in quest of; take as a model, pattern, or ideal}

6 More huge in strength than wise in works he was, 7 And reason with foolhardice overran;

foolhardice > foolhardiness

8 Stern melancholy did his courage pass,

Stern > Fierce, grim, harsh melancholy > melancholy, gloom; irascibility pass > surpass, exceed

9 And was, for terror more, all armed in shining brass.

terror more > [greater terror]

202.18

But he that lou'd the youngest, was Sans-loy,
2 He that faire Vna late fowle outraged,
The most vnruly, and the boldest boy,
4 That euer warlike weapons menaged,
And to all lawlesse lust encouraged,
6 Through strong opinion of his matchlesse might:
Ne ought he car'd, whom he endamaged
8 By tortious wrong, or whom bereau'd of right.
He now this Ladies champion chose for loue to fight.