well > much valiance > valour, bravery
4 As for pure chastity and virtue rare, 5 That all her goodly deeds do well declare.
declare > make clear; declare
6 Well worthy stock, from which the branches sprang 7 That in late years so fair a blossom bore
late > {Recent; belonging to an advanced stage of development [of the line of descent]}
8 As you, O queen, the matter of my song,
queen > [Elizabeth] matter > subject
9 Whose lineage from this lady I derive along.
along > in full; from end to end, in a linear manner; hence: directly
304.4