James Cook was the captain of the Colossal Whale.
Charles once had a relationship with the captain of the White Sea Dragon, Francis Drake, as well as Captain James Cook in Cappadocia City, and with the help of their battle ships, they vanquished a fleet of slave traders. There was an exchange of Gold Pounds between them.
By the way, Charles entrusted Julian with his two thousand Gold Pounds which, after vanquishing Ban Lanmalock, had quadrupled to over eight thousand Gold Pounds. Combined with some he already had, he now possessed over nine thousand Gold Pounds, making him wealthy even by Inglima standards.
Upon seeing James Cook, Charles enthusiastically embraced the other man. James Cook was also quite pleased to see Charles.