Aureolis was the spiritual name of Dr George Sullivan (1890-1942), Peter Caddy's first spiritual teacher. Dr Sullivan was Supreme Magus of the Rosicrucian Order Crotona Fellowship (ROCF), a small initiatory school in the Western mystery tradition, which flourished in England from the 1920s to 40s. The following paper, detailing the history, philosophy and activities of the ROCF, comprises information from several sources. A further reference list is given at the end.