London Declaration concerning the Laws of Naval War
The London Declaration concerning the Laws of Naval War was a proposed international code of maritime law, especially as it relates to wartime activities, in 1909 at the London Naval Conference by the leading European naval powers, the United States and Japan, after a multinational conference that occurred in 1908 in London. The declaration largely reiterated existing law, but dealt with many controversial points, including blockades, contraband and prize, and showed greater regard to the rights of neutral entities.
Source: Wikipedia — London Declaration concerning the Laws of Naval War (CC BY-SA 4.0)