A unicorn horn, also known as an alicorn, is a legendary object whose reality was accepted in Europe and Asia from the earliest recorded times. This "horn" comes from the creature known as a unicorn, also known in the Hebrew Bible as a re'em or wild ox. Many healing powers and antidotal virtues were attributed to the alicorn, making it one of the most expensive and reputable remedies during the Renaissance, and justifying its use in the highest circles. Beliefs related to the alicorn influenced alchemy through spagyric medicine. The horn's purificational properties were eventually put to the test in, for example, the book of Ambroise Paré, Discourse on unicorn.

The Imperial Crown of Austria is a crown formerly in use by the monarchs of the Habsburg monarchy. The crown was originally made in 1602 in Prague by Jan Vermeyen as the personal crown of Holy Roman Emperor Rudolf II, and therefore is also known as the Crown of Emperor Rudolf II. The crown was used as a private crown of the Holy Roman Emperors and Kings of Hungary and Bohemia from the House of Habsburg. In 1804 it became the official crown of the newly constituted Austrian Empire. After 1867 it remained the imperial crown of the Cisleithanian part of the Austro-Hungarian Empire until 1918.