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Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link

King's College is a constituent college of the University of Cambridge.
Grade I listed. Link
King's was founded in 1441 by Henry VI, soon after he had founded its sister college in Eton. However, the King's plans for the college were disrupted by the Wars of the Roses and resultant scarcity of funds, and his eventual deposition. Little progress was made on the project until in 1508 Henry VII began to take an interest in the college, most likely as a political move to legitimise his new position. The building of the college's chapel, begun in 1446, was finally finished in 1544 during the reign of Henry VIII.
Wikipedia: Link
Website: Link