The word grotesque, originally a noun (1560s), from Italian grottesco (through Middle French), literally "of a cave", from Italian grotta (see grotto). The original meaning was restricted to an extravagant style of Ancient Roman decorative art rediscovered and then copied in Rome at the end of the 15th century. The word first was used of paintings found on the walls of basements of Roman ruins that were called at that time Le Grotte (The Grottoes) due to their appearance. These "caves" were in fact rooms and corridors of the Domus Aurea, the unfinished palace complex started by Nero after the Great Fire of Rome in AD 64, which had become overgrown and buried, until they were broken into again, mostly from above. Spreading from Italian to the other European languages, the term was long used largely interchangeably with arabesque and moresque for types of decorative patterns using curving foliage elements.