After much tension, the political situation eventually subsided in Greece and Constantine and his family were allowed to return to their homeland. In 1911, the "Diadochos" was restored in his military duties by the Prime Minister Eleftherios Venizelos. A year later, the First Balkan War broke out, which allowed Greece to annex large territories in Macedonia, Epirus, Crete and the North Aegean. It was also at the end of this conflict that King George I was assassinated in Thessaloniki on 18 March 1913 and Helen's father succeeded him on the Hellenic throne as King Constantine I.