Agnes Castle

Agnes Mary Frances Castle, née Sweetman, was an Irish author born around 1860 or 1861 and active during the late Victorian period. She is especially known for writing in collaboration, both with members of her literary family and with her husband, the writer and historian Egerton Castle.

Her work was part of a remarkably bookish family circle: she was the sister of novelist M. E. Francis, and records of Victorian fiction also note collaborations with her sisters. That shared creative world helped shape a career built on popular storytelling rather than literary showiness.

Some of the fiction she co-wrote proved widely appealing and was later adapted for the stage and for film, which helped keep her name in circulation beyond her own lifetime. She died in 1922, leaving behind a body of work tied closely to the collaborative spirit of her family and marriage.