Here are some excellent books concerning Visigothic art I thought might be of interest to previous threads and our ongoing discussion. Pedro de Palol Tudor Publishing Company, New York 1991 Large Book of 236 pages.
Text is in the same four languages as above.
The Metropolitan Museum of Art, New York Dist. Though this Book deals with the Medieval period, a section is devoted to Visigothic as well as Asturian Art. Noteworthy is the picture plate on Page 68. It shows one of a matching pair of horse bits attributed to King Witiza which I have been researching for quite some time. The unusual thing about these bits is that they do not have fillet reins, that is, the bits were not intended for a mounted rider but rather to be guided along by a valet, suggesting that the bits had a specialized purpose.