"Who hath not seen thee oft amid thy store?" is an example of-

A figure of speech in which lifeless objects or ideas are given imaginary life known as Personification.
Examples-
''And Joy, whose hand is ever at his lips Bidding adieu'' (Keats: 'Ode on Melancholy')
- here 'Joy' has been imagined as a living person.
"Who hath not seen thee oft amid thy store?" (Keats: 'To Autumn')

Source: An ABC of English Literature, Dr. M Mofizar Rahman.