Moctezuma's headdress is a featherwork crown ( ) which tradition holds belonged to Moctezuma II, the Aztec emperor at the time of the Spanish conquest. However, its provenance is uncertain, and even its identity as a headdress has been questioned. It is made of quetzal and other feathers with sewn-on gold detailing. It is now in the Weltmuseum Wien, and is a source of dispute between Austria and Mexico, as no similar pieces remain in Mexico. Restoration efforts reignited this dispute in 2012.