"Its subject is the slow and erratic process by which the peoples of the British Isles learnt - and then for long periods forgot - about the 'Safeguard of the Sea', as the 15th century phrase had it, meaning the use of the sea for national defence, and the defence of those who used the sea."

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It is not surprising that only one medieval state, Venice, long possessed anything clearly identifiavble as a navy in this sense. We shall see that no state in the British Isles attained attained this level of sophistication before the 16th century, and no history of the Royal Navy, in any exact sense of the words, could legitimately begin much before then. This book, which does, is not an institutional history of the Royal Navy, but a history of naval warfare as an aspect of national history. All and any methods of fighting at sea, or using the sea for warlike purposes, are its concern.

— Nicholas Rodger