The Shield of the Trinity or Scutum Fidei is a traditional Christian visual symbol which expresses many aspects of the doctrine of the Trinity, summarizing the first part of the Athanasian Creed in a compact diagram. In medieval England and France, this emblem was considered to be the heraldic arms of God (and of the Trinity). The precise origin of this diagram is unknown, but it was evidently influenced by 12th-century experiments in symbolizing the Trinity in abstract visual form, mainly by Petrus Alfonsi's Tetragrammaton-Trinity diagram of ca. 1109.
The Shield of the Trinity diagram is attested from as early as a ca. 1208-1216 manuscript. The diagram was used heraldically from the mid-13th century, when a shield-shaped version of the diagram (not actually placed on a shield) was included among the heraldic shields in Matthew Paris' Chronica Majora, ca. 1250. Allegorical illustrations ca. 1260 show the diagram placed on a shield. The period of its most widespread use was during the 15th and 16th centuries, when it is in found in a number of English and French manuscripts, books, stained-glass windows and ornamental carvings. (more...)
