Joseph Blaine
From WikiPOBia
Sir Joseph Blaine is a senior official in the Royal Navy's intelligence service. He is Stephen Maturin's prime contact with the Admiralty. He is also an enthusiastic entomologist and member of the Royal Society which provides Maturin with a good cover for their frequent meetings.
Blaine first appears in Post Captain when he arranges for Maturin to receive an honorary positions as a post captain for the capture of the Spanish treasure fleet so that he can share in the prize money.