The genesis of an elaborate theory of signs in the second half of the 13th century is the result of a complex interplay of Aristotelian and Augustinian influences. Since the mid-13th century Augustinian views, until then effective mainly in theological discussions, begin to invade the faculties of arts. Due to this, the sign is increasingly taken as the basic concept of the ‘linguistic science’ (scientia sermocinalis):[16] “Speech is nothing but a sign” (Sermo totaliter signum est), Robert Kilwardby asserts (Kilwardby De ortu scientiarum, 1976, 160). Roger Bacon praises the sign even as the principal instrument of all Liberal Arts.[17] It is true, the consciousness of words being signs is nothing new. From this point onward, however, it gives rise, at first in the framework of grammar theory, to semiotic reflections that go beyond what is known from earlier centuries.