That > [So that] Scuith guiridh > Green Shield (Welsh, referring to his surname: cf. 210.23:2)

9 But rather y Scuith gogh, sign of sad cruelty.

y Scuith gogh > Red Shield (Welsh) sign > emblem; banner, standard sad > sad; heavy, grievous

210.25

His sonne king Leill by fathers labour long,
2 Enioyd an heritage of lasting peace,
And built Cairleill, and built Cairleon strong.
4 Next Huddibras his realme did not encrease,
But taught the land from wearie warres to cease.
6 Whose footsteps Bladud following, in arts
Exceld at Athens all the learned preace,
8 From whence he brought them to these saluage parts,
And with sweet science mollifide their stubborne harts.

1 His son, King Leill (by father's labour long),

by > [by virtue of, as a result of]

2 Enjoyed a heritage of lasting peace, 3 And built Carlisle, and built Caer-lion strong.

Caer-lion > Caerleon-upon-Usk strong > (Adj. or adv.)

4 Next Huddibras his realm did not increase, 5 But taught the land from weary wars to cease. 6 Whose footsteps Bladud following, in arts 7 Excelled at Athens all the learned press,