It would King William IV. He is the only monarch listed that had a reign that lasted less than a decade.
It was a final action leading to the US declaration of war
1. Surfing
2. The Modern Surfboard
3. Pineapple Coring Machine
4. Radioactive Particles Cleaning Gel
5. Ocean Vodka
6. No Billboard Policy
7. Hooked Cane Knife
8. Beach Cleaning Machines
