Question: Xokonoschtletl Gómora pushed for hte return of what artifact taken during hte Spanish Conquest of the Aztecs?

Context paragraphs:
Cupul: Cupul or Kupul, (Maya: "Kupul", 'toponímico; adjective') was the name of a Maya chiefdom at time of the Spanish conquest of Yucatán.  Cupul was one of the most extensive and densely populated Maya provinces on the Yucatán Peninsula.  It was formed in the mid-fifteenth century after the fall of Mayapan and reached its maximum power during the sixteenth century, at the time of their own led by the Spanish conquest led by the "adelantado" Francisco de Montejo.  According to the Encyclopedia Yucatán in time, the Mayan voice ku-pul, means "that throws the bouncing", giving a connotation referring to the Mayan ballplayers that existed in the region.

Pueblo Culhuacán: Pueblo Culhuacán (   ) is an officially designated neighborhood of the Iztapalapa borough of Mexico City, which used to be a major pre Hispanic city.  Ancient Culhuacán was founded around 600 CE and the site has been continuously occupied since.  The city was conquered by the Aztecs in the 15th century, but the Aztecs considered the city to have status with early rulers marrying into Culhua nobility to legitimize themselves.  After the Spanish conquest of the Aztec Empire, the Franciscans and later the Augustinians made Culhuacán a major evangelization center, with the latter building the monastery complex which remains to this day.  Today, Culhucan is fully integrated into Mexico City physically and politically.  This area was designated as a "Barrio Mágico" by the city in 2011.

Montezuma's headdress: Moctezuma's headdress is a featherwork crown (Nahuatl: "quetzalāpanecayōtl" ] ) 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 Museum of Ethnology, Vienna, and is a source of dispute between Austria and Mexico, as no similar pieces remain in Mexico.  Restoration efforts reignited this dispute in 2012.

Conquest of the Azores: The Conquest of the Azores (also known as the "Spanish conquest of the Azores"), but principally involving the conquest of the island of Terceira, occurred on 2 August 1583, in the Portuguese archipelago of the Azores, between forces loyal to the claimant D. António, Prior of Crato, supported by the French and English troops, and the Spanish and Portuguese forces loyal to King Philip II of Spain, commanded by the Admiral Don Álvaro de Bazán, Marquis of Santa Cruz, during the War of the Portuguese Succession.  The victory of the Marquis of Santa Cruz resulted in the rapid Spanish conquest of the Azores, facilitating the integration of the Kingdom of Portugal and its colonial possessions into the Spanish Empire.

Aubin Codex: The Aubin Codex is a textual and pictorial history of the Aztecs from their departure from Aztlán through the Spanish conquest to the early Spanish colonial period, ending in 1607.  Consisting of 81 leaves, it was most likely begun in 1576, it is possible that Fray Diego Durán supervised its preparation, since it was published in 1867 as Historia de las Indias de Nueva-España y isles de Tierra Firme, listing Durán as the author.

Lake Texcoco: Lake Texcoco (Spanish: "Lago de Texcoco" ) was a natural lake within the Anáhuac or Valley of Mexico.  Lake Texcoco is best known as where the Aztecs built the city of Tenochtitlan, which was located on an island within the lake.  After the Spanish conquest of the Aztec Empire, efforts to control flooding by the Spanish led to most of the lake being drained.  The entire lake basin is now almost completely occupied by Mexico City, the capital of the present-day nation of Mexico.

Xokonoschtletl Gómora: Xokonoschtletl Gómora (] ; 17 February 1951, Mexico City) is a Mexican dancer who performs to Pre-Hispanic traditional music, a writer, lecturer, and civic activist.  He was commissioned by the United Nations for the Frente Mexicano Pro Derechos Humanos (English: Mexican Front for Human Rights) to promote the protection of Mexican cultural heritage.  He is best known for leading the Asociación Civil Internacional Yankuik Anahuak (International Civil Association Yankuik Anahuak) and because for over thirty years he has pushed for the return of a quetzal feather headdress (Nahuatl: "quetzalpanecáyotl") known as Montezuma's headdress currently located in the Vienna Museum of Ethnology (German: "Museum für Völkerkunde").

Spanish conquest of Yucatán: The Spanish conquest of Yucatán was the campaign undertaken by the Spanish "conquistadores" against the Late Postclassic Maya states and polities in the Yucatán Peninsula, a vast limestone plain covering south-eastern Mexico, northern Guatemala, and all of Belize.  The Spanish conquest of the Yucatán Peninsula was hindered by its politically fragmented state.  The Spanish engaged in a strategy of concentrating native populations in newly founded colonial towns.  Native resistance to the new nucleated settlements took the form of the flight into inaccessible regions such as the forest or joining neighbouring Maya groups that had not yet submitted to the Spanish.  Among the Maya, ambush was a favoured tactic.  Spanish weaponry included broadswords, rapiers, lances, pikes, halberds, crossbows, matchlocks and light artillery.  Maya warriors fought with flint-tipped spears, bows and arrows and stones, and wore padded cotton armour to protect themselves.  The Spanish introduced a number of Old World diseases previously unknown in the Americas, initiating devastating plagues that swept through the native populations.

Neo-Inca State: The Neo-Inca State, also known as the Neo-Inca state of Vilcabamba, was the Inca state established by Inca emperor Huayna Capac's son Manco Inca Yupanqui in Vilcabamba in 1537.  It is considered the remnants of the Inca Empire (1438–1533) after the Spanish conquest.  It lasted until 1572, when the last Inca stronghold was conquered, and the last ruler, Túpac Amaru, Manco's son, was captured and executed.  This ended resistance to the Spanish conquest under the political authority of the Inca state.

Spanish conquest of Guatemala: The Spanish conquest of Guatemala was a protracted conflict during the Spanish colonization of the Americas, in which Spanish colonisers gradually incorporated the territory that became the modern country of Guatemala into the colonial Viceroyalty of New Spain.  Before the conquest, this territory contained a number of competing Mesoamerican kingdoms, the majority of which were Maya.  Many conquistadors viewed the Maya as "infidels" who needed to be forcefully converted and pacified, disregarding the achievements of their civilization.  The first contact between the Maya and European explorers came in the early 16th century when a Spanish ship sailing from Panama to Santo Domingo was wrecked on the east coast of the Yucatán Peninsula in 1511.  Several Spanish expeditions followed in 1517 and 1519, making landfall on various parts of the Yucatán coast.  The Spanish conquest of the Maya was a prolonged affair; the Maya kingdoms resisted integration into the Spanish Empire with such tenacity that their defeat took almost two centuries.

Supporting paragraphs: Xokonoschtletl Gómora Montezuma's headdress
Answer: Montezuma's headdress