Factual error: When they first meet, Rodrigues tells Blackthorne that aboard his ship there is plenty of food and grog. The problem is that grog was not "invented" until 1740, when it was introduced into the British Navy by Admiral Edward Vernon, who was nicknamed "Old Grog" because of his habit of wearing a grogram coat.
Trivia: The characters John Blackthorne and Toranaga are based upon two historical figures: Togukawa Ieyasu and William Adams, an Englishman who both became a samurai and a close advisor to Ieyasu in the 1600s.
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