3 So long as heavens just with equal brow

heavens just > [the] just heavens equal > impartial brow > countenance

4 Vouchsafed to behold us from above. 5 One day, when him high courage did amove

amove > stir

6 (As wont you knights to seek adventures wild),

wont you knights > you knights are accustomed

7 He pricked forth, his puissant force to prove;

pricked > spurred; hence: rode puissant > mighty (esp. in relation to deeds of arms)

8 Me then he left enwombed of this child,

enwombed of > [holding in the womb, pregnant with]