The concept of a rating system for British naval vessels dates to the accession of James I of England, following which the fleet was formally divided into "great", "middling" and "lesser" craft.A 1618 commission of enquiry added a further designation of "Ships Royal" for the largest and most prestigious vessels in the fleet, each capable of carrying at least 400 men.Their condition was generally poor, with Elizabeth Jonas and Triumph already completely unserviceable and White Bear so unseaworthy that she was sold for scrap in 1627.[2][4] The Navy's rating system was later modified to differentiate ships considered suitable for various functions within the naval tactics of the age of sail.To do otherwise was to risk swamping the entire vessel, as occurred in 1781 when the first-rate Royal George sank at anchor at Spithead after the lower gunports were opened to air the ship.The Royal Navy's use of the term "first-rate" to describe its largest and most powerful vessels is the origin of the modern English-language meaning of "exceptionally good" or "of the highest quality.
The first-rate
Royal George
sank at anchor in 1781 after she was flooded through her lower gunports.