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The ranks of the UK peerage are duke, marquess, earl, viscount, and baron.
A baronetcy is an hereditary title awarded by the British Crown, and (with a couple of exceptions) is the only British hereditary honour that is not a peerage.
Baronetcies were originally introduced in England during the 14th century. They were used extensively by King James I/VI as a means of raising funds or incentivising other projects - like the settlement of Nova Scotia.