Emperor
The first Austrian Emperor was the last Holy Roman Emperor Francis II. In the face of aggressions by Napoleon, Francis feared for the future of the Holy Roman Empire. He wished to maintain his and his family's Imperial status in the event that the Holy Roman Empire should be dissolved, as it indeed was in 1806 when an Austrian-led army suffered a humiliating defeat at the Battle of Austerlitz. After which, the victorious Napoleon proceeded to dismantle the old "Reich" by severing a good portion from the empire and turning it into a separate Confederation of the Rhine. With the size of his imperial realm significantly reduced, Francis II, "Holy Roman Emperor" became Francis I, "Emperor of Austria". The new imperial title may have sounded less prestigious than the old one, but Francis' dynasty continued to rule from Austria and a Habsburg monarch was still an emperor ("Kaiser"), and not just merely a king ("König"), in name.
Austrian Crown Jewels
The Imperial Regalia are the insignia of the Holy Roman Empire. After 1438, the Holy Roman Empire was ruled by the House of Habsburg, with only one brief exception. From 1508, after his election, the German King no longer called for the coronation by the Pope either, but considered himself Roman emperor directly. The crown was probably used for the first time for the coronation of Konrad II; the last time was for Franz II in 1792.