5 And all that gentle nouriture ensues:

gentle > noble nouriture > {Nurture, the business of bringing up a child} ensues > follows, conforms to; hence: involves, entails

6 And that (so soon as riper years he raught)

raught > reached

7 He might, for memory of that day's ruth,

ruth > sorrow; calamity; occasion of regret

8 Be called Ruddymane, and thereby taught

Ruddymane > "Bloody-handed"

9 To avenge his parents' death on them that had it wrought.

203.3