Louis the Child (Italian: Ludovico or Luigi; 4 February 1338 – 16 October 1355) was King of Sicily (also known as "Trinacria") from 15 September 1342 until his death. He was a minor upon his succession, and was under a regency until 1354. His actual rule was short, for he died in an outbreak of plague the next year. His reign was marked by civil war.
Born in Catania, Louis was the son of King Peter II and Elisabeth of Carinthia. On the day of his birth, his father announced him as his heir in a proclamation to the municipal governments (universitates) of the realm. Louis was the first male child of Peter since the death of the firstborn, Frederick, in 1325. On 12 February, Peter issued a privilege to the city of Catania exempting it from the payment of the customary hospitality to the royal court. He also credited the intervention of Catania's patron saint, Agatha, on whose feast the child was born, for the successful delivery of a boy.
Louis was only five years old when his father died on 15 August 1342, and he was not immediately given the title of king. His uncle, Marquis John of Randazzo, already Peter's second-in-command as vicar, assumed the regency. During his father's lifetime, Louis was called primogenitus (first born) and infans (royal prince, i.e. infante). After his father's death and before his own coronation, he was titled successor. On 10 September John ordered the citizens of Palermo to nominate their representatives to swear the oath of fealty at Louis's coronation. Louis was crowned in the cathedral of Palermo on 15 September and thereafter he bore the title of king (rex).
After his coronation, Louis lived at Catania from October 1342 until at least March 1343. Towards the end of 1344 negotiations were begun to marry Louis to Constance, the newborn daughter of Peter IV of Aragon. In June 1346 an ambassador from Louis of Hungary arrived proposing a marriage between Louis and one of the Hungarian king's relatives.