Lady Dorothea Du Bois (1728–1774) was an Irish poet, autobiographer and musical dramatist, whose claims on her father's estate were never met.
About 1752, Dorothea secretly married Du Bois, a French musician, and became the mother of six children.
In 1759 she heard that her father had made a will leaving her five shillings, in quit of all demands, as his natural daughter; in 1760, on recovery from the birth of her sixth child, she undertook a journey to Camolin Park, Wexford, where he was lying ill, to induce him to acknowledge his marriage to her mother.
A writer in the Critical Review commented "as the ground-work of this novel has appeared lately in most of the news-papers, we think it needless to relate again the [Anglesey] story with fictitious names".
Meanwhile, the Anglesey estates were subject to lawsuits from various sides, but none of them benefited Lady Dorothea.