|A title for a marquis, earl, viscount, or baron (whether a peer or a
peer's eldest son holding his father's second title by courtesy), never
used with of:
Lord Hartington, Lord Derby, Lord Manvers, Lord Palmerston may be used instead of
the Marquis of Hartington, the Earl of Derby, Earl Manvers, Viscount Palmerston.
It is prefixed as a courtesy title to the given name, with or without a surname, of a younger son of a duke or marquis:
Lord Randolph Churchill (the third son of the seventh Duke of Marlborough) or Lord Randolph never as Lord Churchill
Lord John Russell.
A baron (whether a peer or a peer's eldest son known by the title of his
father's barony) is always called by his title of peerage (either a
surname or a territorial designation), preceded by Lord:
If the given name is mentioned, it comes first:
Alfred, Lord Tennyson
Thomas, Lord Fairfax
As part of the titles of certain high officials and dignitaries:
the Lord Mayor of London
the Lord Chancellor
the Lords of the Admiralty.
As a ceremonial title for any bishop or archbishop of the Church of England:
For specific British titles consult a source such as Burke's Peerage or Debrett's Peerage.
Context generally determines when the use of titles such as Sir and Lord are
A comment about Paul McCartney's being knighted would
probably use Sir Paul,
but a reference to the rock musician might style
him simply Paul McCartney.
See also Lady, ROYALTY AND NOBILITY.