This is a remarkable instance of the use of whom for who in the nominative. See W. Tale, ad fin.
"Where we in all our trim freshly beheld
Our royal, good, and gallant ship."
For 'our' in the first line we must of course read her with Thirlby and Theobald. It was probably caused by the 'Our' of the next line; but from similarity of pronunciation our is sometimes confounded with her and a.
"Ever in a dream were we divided from them."
For 'them' we should perhaps read her.
"This is a strange thing as e'er I look'd on."