 As these titles are merely courtesy titles, the holder is not by virtue of the title a member of the peerage and is not entitled to use the definite article "The" as part of the title.Sons of British Princes, would also use a similar style if the holder doesn't have a peerage.The upper house of the Parliament of the United Kingdom is the House of Lords, which is an abbreviation of the full title, "The Right Honourable the Lords Spiritual and Temporal in Parliament Assembled".