Plan of St Gall

The Plan of Saint Gall is a famous medieval architectural drawing of a monastic compound dating from the early 9th century. It is preserved in the Stiftsbibliothek Sankt Gallen, Ms 1092.

It is the only surviving major architectural drawing from the roughly 700-year period between the fall of the Western Roman Empire and the 13th century. It is considered a national treasure of Switzerland and remains an object of intense interest among modern scholars, architects, artists and draftsmen for its uniqueness, its beauty, and the insights it provides into medieval culture.

The Plan depicts an entire Benedictine monastic compound including churches, houses, stables, kitchens, workshops, brewery, infirmary, and even a special house for bloodletting. The Plan was never actually built, and was so named because it was kept at the famous medieval monastery library of the Abbey of St. Gall, where it remains to this day. It was drawn in a scriptorium in Reichenau in the third decade of the 9th century, dedicated to Abbot Gozbert (816–836) of Saint Gall.

The Plan was created from five parchments sewn together measuring 45 inches by 31 inches (113 cm by 78 cm) and drawn in red ink lines for the buildings, and brown ink for lettered inscriptions. It is drawn to an "unusual" scale of 1:192 (although as explained in detail in "The Plan of St. Gall in brief" by Lorna Price, this is 1/16" to the foot, which would not be so surprising as necessary to place the overall plan onto this size piece of parchment). The reverse of the Plan was inscribed in the 12th century, after it had been folded into book form, with the Life of Saint Martin by Sulpicius Severus. About 350 partly rhyming appendices in the handwritings of two different scribes describe the functions of the buildings. The dedication to Abbot Gozbert is written in the margin.

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