Duchess of St Albans

Duchess of St Albans is a title given to the wife of the Duke of St Albans, an extant title in the Peerage of England, created in 1684 by King Charles II and given to his illegitimate child with Nell Gwynn, Charles Beauclerk, 1st Duke of St Albans. Gillian Northam is the current Duchess, as the third wife of the current Duke, Murray Beauclerk, 14th Duke of St Albans, since their marriage in 2002.

Duchesses of St Albans

Jane Mary Moses married Aubrey Beauclerk (later the 6th Duke) in 1788 but died in 1800. Aubrey became the Duke in 1802 and, therefore, Jane never became Duchess.
Charlotte Thelwell married William (later the 8th Duke) in 1791. She died in 1797, however never became Duchess, as William only became the Duke in 1816.
Nathalie Walker married Charles (later the 13th Duke). They divorced in 1947, and Nathalie never became Duchess, as Charles only became the Duke in 1964.
Rosemary Frances Scoones married Murray (later the 14th Duke). They divorced in 1974, and Rosemary never became Duchess, as Murray only became the Duke in 1988.

George Beauclerk, 4th Duke of St Albans died unmarried and childless in 1787, therefore there was no Duchess consort during this period. The title passed to his cousin Aubrey Beauclerk, 5th Duke of St Albans.
The 7th Duke, Aubrey, died in childhood, and therefore never got married or had any issue.
Charles Beauclerk, 11th Duke of St Albans, died unmarried and childless in 1934, and was succeeded by his half-brother, Osborne, who became the 12th Duke.