There are 2 titles associated with this person.

Liddiard, Jane, S., A., and William Liddiard. Mont St. Jean, A Poem, by William Liddiard; Theodore and Laura, A Tale, by I. S. Anna Liddiard, author of Kenilworth, and other poems. London: Longman, Hurst, Rees, Orme, and Brown, John Cumming, 1816.
Liddiard, William, and Jane S. A. Liddiard. Mount Leinster; or, the Prospect: a poem, descriptive of Irish scenery, &c. &c. &c. London: Longman, Hurst, Rees, Orme, and Brown, Richard Milliken, 1819.