The modern cittern may also be loosely included in an "extended" mandolin family, based on resemblance to the flat-backed mandolins, which it predates. Its own lineage dates it back to the Renaissance. It is typically a five course (ten string) instrument having a scale length between . The instrument is most often tuned to either D2–G2–D3–A3–D4 or G2–D3–A3–D4–A4, and is essentially an octave mandola with a fifth course at either the top or the bottom of its range. Some luthiers, such as Stefan Sobell, also refer to the octave mandola or a shorter-scaled Irish bouzouki as a cittern, irrespective of whether it has four or five courses.