3 That Saxon kings his friendship shall entreat;

That > [So that]

4 And Howell Dha shall goodly well endue

Howell Dha > (King of Wales, died 948)

5 The savage minds with skill of just and true;

skill of > [the] knowledge of [the]

6 Then Griffith ap Cynan also shall uprear

Griffith ap Cynan > (King of Wales, died 1136)

7 His dreaded head, and the old sparks renew 8 Of native courage, that his foes shall fear

that > [so that]