8 So raged Prince Arthur 'twixt his foemen twain,

foemen > enemies twain > two, double, twofold (emphasizing their unfairness)

9 That neither could his mighty puissance sustain.

That > [So that] puissance > strength, power sustain > endure, withstand

208.43

But euer at Pyrochles when he smit,
2 Who Guyons shield cast euer him before,
Whereon the Faery Queenes pourtract was writ,
4 His hand relented, and the stroke forbore,
And his deare hart the picture gan adore,
6 Which oft the Paynim sau'd from deadly stowre.
But him henceforth the same can saue no more;
8 For now arriued is his fatall howre,
That no'te auoyded be by earthly skill or powre.

1 But ever at Pyrochles when he smote 2 (Who Guyon's shield cast ever him before, 3 Whereon the Faery Queen's portrait was writ),

Whereon > On which writ > drawn, painted

4 His hand relented, and the stroke forbore, 5 And his dear heart the picture gan adore,

dear > loving gan > did