st of the golden fleece,

conquest > {Booty; that which is obtained by force of arms}
golden fleece > (Which was suspended in an oak tree in the Grove of
Mars at Colchis, in Asia Minor, and guarded day and night by a
dragon. Jason was persuaded to go on this quest by Pelias, king
of Iolcus in Thessaly)

7 His falsed faith, and love too lightly flit,

falsed > counterfeited; proved false
flit > shifted, altered; _hence:_ transferred

8 The wondered Argo, which in venturous piece

wondered > marvelled at
Argo > (A ship of 50 oars, commissioned by Jason for his quest and
named after its builder, Argus)
venturous > [that] bold; [that] adventurous
piece > piece of work, masterpiece; _hence:_ daring exploit

9 First through the Euxine seas bore all the flower of Greece.

Euxine seas > Euxinus, Black Sea
the flower of Greece > (Jason was accompanied by more than 50 of the
greatest heroes of Greece: Hercules, Theseus, Castor and Pollux,
etc.)

212.45

Ye might haue seene the frothy billowes fry
2 Vnder the ship, as thorough them she went,
That seemd the waues were into yuory,
4 Or yuory into the waues were sent;
And other where the snowy substaunce sprent
6 With vermell, like the boyes bloud therein shed,
A piteous spectacle did represent,
8 And otherwhiles with gold besprinkeled;
Yt seemd th'enchaunted flame, which did _Cre{u"}sa_ wed.

1 You might have seen the frothy billows fry

fry > seethe, foam

2 Under the ship, as through them she went,
3 That seemed the waves were into ivory,

That > [So that it]

4 Or ivory into the waves were sent;

sent > sent, _hence:_ transmuted; _also:_ sended (used of a ship
pitching deeply with head or stern in the trough of a wave)

5 And otherwhere the snowy substance sprent

otherwhere > elsewhere
sprent > sprinkled (pa. ppl. of "sprenge")

6 With vermeil, like the boy's blood therein shed,

vermeil > scarlet
the boy > (See note on Jason and Medea at 212.44:4)

7 A piteous spectacle did represent,

represent > bring to mind; make manifest; symbolize

8 And otherwhiles with gold besprinkled:

otherwhiles > at other times; now and then (the original pointing
also suggests: "And otherwhiles, with gold besprinkled, It seemed
the enchanted flame ...")
besprinkled > {Sprinkled all over; the prefix is intensive}

9 It seemed the enchanted flame which did Cre{u"}sa wed.

seemed > [seemed to be]