Priscianus
A Latin grammar manuscript of Priscian's Institutiones grammaticae, copied around 1100 and held by a Swiss library, probably for monastic or school use. Its pictures are hand-painted initials in red, blue, ochre and green, some with flourished interlace and foliage, others as pale figures on a blue field, and a designer could borrow their bold interlocking letterforms and limited earthy palette for display lettering.
