Marie de Coucy
Alexander II died on 8 July 1249 during an expedition against the Lord of Argyll on the island of Kerrera. Immediately after the news reached her, Marie made sure her 8-year-old son was crowned as soon as possible at Scone. Although her son was a minor and was placed under regency, Marie did not become regent. On 9 June 1250 Marie and her son Alexander III were present in Dunfermline for the observance of the canonisation of Saint Margaret of Scotland and the transference of her remains to the new shrine.
Classical Greece
Philip II was assassinated at the wedding of his daughter Cleopatra of Macedon with King Alexander I of Epirus in 336 BC. Philip's son, the future Alexander the Great, immediately claimed the throne of Macedonia by eliminating all the other claimants to the throne, including Caranus and his cousin Amytas. Alexander was only twenty (20) years of age when he assumed the throne.