Insular art refers to the distinct style found in Ireland and Britain from about the 7th century, to about the 10th century, lasting later in Ireland, and parts of Scotland. The style saw a fusion between the traditions of Celtic art, the Germanic Migration period art of the Anglo-Saxons and the Christian forms of the book, high crosses and liturgical metalwork. Extremely detailed geometric, interlace, and stylised animal decoration, with forms derived from secular metalwork like brooches, spread boldly across manuscripts, usually gospel books like the Book of Kells, with whole carpet pages devoted to such designs, and the development of the large decorated and historiated initial. There were very few human figures—most often these were Evangelist portraits—and these were crude, even when closely following Late Antique models.
The insular manuscript style was transmitted to the continent by the Hiberno-Scottish mission, and its anti-classical energy was extremely important in the formation of later medieval styles. In most Late Antique manuscripts text and decoration were kept clearly apart, though some initials began to be enlarged and elaborated, but major insular manuscripts sometimes take a whole page for a single initial or the first few words (see illustration) at beginnings of gospels or other sections in a book. Allowing decoration a "right to roam" was to be very influential on Romanesque and Gothic art in all media.
The buildings of the monasteries for which the insular gospel books were made were then small and could fairly be called primitive, especially in Ireland. There increasingly were other decorations to churches, where possible in precious metals, and a handful of these survive, like the Ardagh Chalice, together with a larger number of extremely ornate and finely made pieces of secular high-status jewellery, the Celtic brooches probably worn mainly by men, of which the Tara Brooch is the most spectacular.
"Franco-Saxon" is a term for a school of late Carolingian illumination in north-eastern France that used insular-style decoration, including super-large initials, sometimes in combination with figurative images typical of contemporary French styles. The "most tenacious of all the Carolingian styles", it continued until as late as the 11th century.
