gan > did
4 Out of the sea fair Titan's dewy face, 5 Up rose the gentle virgin from her place,
gentle > gentle; noble
6 And looked all about, if she might spy
if > [in the hope that]
7 Her beloved knight to move his manly pace:
to move > [moving]
8 For she had great doubt of his safety,
doubt of > fear for
9 Since late she saw him fall before his enemy.