His Imperial Majesty Aggelos I ruled as Emperor of Austenasia for a year and one day, from 29 September 2024 to 30 September 2025, having previously served as Prince Regent during the last months of the reign of Jonathan I.

Prior to his reign, Aggelos had a long history of involvement with and contributions to Austenasia, founding a Town in 2016 and having two non-consecutive tenures as a Representative in Parliament. The ruler of the Hellenic nation of Imvrassia from 2011-16 and again since 2020, Aggelos oversaw an increasingly close and friendly relationship between Imvrassia and Austenasia helped by his friendship with Jonathan I, with whom he bonded over their shared Orthodox Christian faith and love of Greco-Roman history.

Aggelos was the first Heir appointed by the Senate on a meritocratic rather than a hereditary basis. Upon the abdication of Jonathan I, he ascended the Throne as Emperor of Austenasia.

The reign of Aggelos I saw many challenges, most notably a coup attempt by Andrew Musgrave, the then Prime Minister. Musgrave unsuccessfully attempted to depose the Emperor in June 2025 after Aggelos called for early elections, and was ultimately expelled by Parliament. However, the reign of Aggelos I also saw constitutional reform, large territorial expansion in North America, and the entrenchment of democratic parliamentary representation for non-residential subjects.

Ultimately, also being responsible for the governance of Imvrassia, Aggelos I announced his intention to abdicate upon the first anniversary of his ascension to the Austenasian Throne. He remains a Senator, and thereby helps to advise his successor, the incumbent Emperor Alexander VI.