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.
Mauro-Roman Kingdom
The last recorded king of the "Regnum Maurorum et Romanorum" was Garmul (also known as Garmules) who would resist Eastern Roman rule in Africa. In the late 560s, Garmul launched raids into Roman territory, and although he failed to take any significant town, three successive generals, Praetorian prefect Theodore (in 570 AD) and the two "magistri militum" Theoctistus (in 570 AD) and Amabilis (in 571 AD), are recorded by the Visigoth historian John of Biclaro to have been killed by Garmul's forces. His activities, especially when regarded together with the simultaneous Visigoth attacks in Spania, presented a clear threat to the province's authorities. Garmul was not the leader of a mere semi-nomadic tribe, but of a fully-fledged barbarian kingdom, with a standing army. Thus, the new Eastern Roman emperor, Tiberius II Constantine, re-appointed Thomas as praetorian prefect of Africa, and the able general Gennadius was posted as "magister militum" with the clear aim of reducing Garmul's kingdom. Preparations were lengthy and careful, but the campaign itself, launched in 577–78 AD, was brief and effective, with Gennadius utilizing terror tactics against Garmul's subjects. Garmul was defeated and killed in 578 AD.