William Faulkner, 1929. The Compson family's Mississippi decline told in four narrators including Benjy's interior monologue.
From Wikipedia
The Sound and the Fury is a novel by the American author William Faulkner, published in 1929. Faulkner's fourth novel, it is the second to be set in Yoknapatawpha County and the first featuring the Compson family, both of which would reappear in his later fiction. The novel's highly experimental style, including its use of stream of consciousness and multiple different unreliable narrators, are hallmarks of modernist literature. Its bleak and candid portrait of Southern life in the early 20th century is paradigmatic of the Southern Gothic genre.