Which king does Isaiah 44:28 call the LORD's shepherd?

Answer: Cyrus

God says of Cyrus, "My shepherd will fulfill all that I desire," and calls him "His anointed" in Isaiah 45:1.

“who says of Cyrus, ‘My shepherd will fulfill all that I desire,’ who says of Jerusalem, ‘She will be rebuilt,’ and of the temple, ‘Let its foundation be laid.’””— Isaiah 44:28 (BSB)