"Chapelry formerly annexed to Henbury, now to Olveston. Civil parish includes Elberton and Littleton-upon-Severn since 1935." (Ref: Guide to the Parish Records of the City of Bristol and the County of Gloucester; I. Gray & E. Ralph, 1963)
You can see the administrative areas in which Aust has been placed at times in the past.
Select one to see a link to a map of that particular area.