As the young queen, Elizabeth's primary occupation was the production of viable heirs for the Sicilian throne, as task she took up soon after marriage. Less than two years after their wedding, Peter II and Elizabeth had a son in Messina in February 1324, whom they named Frederick. Unfortunately, he died a few months after his birth. Following the death of their first born, Elizabeth and Peter II had seven more children, their first four daughters whom survived to maturity were; Constance (1324 – October 1355), regent of Sicily for her younger brother, Louis, from 1352 to 1354 following the death of her mother, Elizabeth. Constance never married. Their second daughter, Eleanor (1325-1375), married Peter IV of Aragon, and was the mother of John I of Aragon and Martin the Humane. Beatrice (1326–1365) their third daughter, married Rupert II, Elector Palatine, and they had Rupert of Germany. Their fourth surviving child, Euphemia (1330–1359) was regent for her brother Frederick IV of Sicily from 1355 to 1357. Like her sister Constance, Euphemia never married.