Agnes Mary Frances Castle (née Sweetman, c. 1860/1861 – 1922) was an Irish writer active during the Victorian era. She is distinguished by her highly collaborative approach to literature, frequently co-authoring her stories with her sisters as well as with her husband.
Although details of her individual life remain sparse, the narrative works she co-created achieved significant reach. Several of her collaborative stories served as the creative basis for multiple stage plays and early film adaptations, demonstrating the cross-media appeal of her collective literary output.
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