most famous hight > most famously called; hence: best known

8 For skill in music of all in her days, 9 As well in curious instruments, as cunning lays.

well > much curious > {Requiring musical virtuosity} as > [as in] cunning > clever, skilled lays > songs

210.60

Of whom he did great Constantine beget,
2 Who afterward was Emperour of Rome;
To which whiles absent he his mind did set,
4 Octauius here lept into his roome,
And it vsurped by vnrighteous doome:
6 But he his title iustifide by might,
Slaying Traherne, and hauing ouercome
8 The Romane legion in dreadfull fight:
So settled he his kingdome, and confirmd his right.

1 Of whom he did great Constantine beget,

Constantine > (Constantine I, "The Great", 274-337, emperor of Rome 306-37. Eldest son of Constantius I by Helena)

2 Who afterward was emperor of Rome; 3 To which, while absent, he his mind did set;

which > [Rome] absent > [absent in Rome] set > [devote]

4 Octavius here leapt into his room,