Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Peter the Great was the King of Aragon (as Peter III) of Valencia and of Majorca (as Peter I), and Count of Barcelona (as Peter II) from 1276 to his death. He conquered Sicily and became its king in 1282. He was one of the greatest of medieval Aragonese monarchs. Peter was the eldest son of James I of Aragon and his second wife Yolanda of Hungary. On 13 June 1262, he married Constance, daughter and heiress of Manfred of Sicily. During his youth and early adulthood, Peter gained a great deal of military experience in his father''s wars of the Reconquista against the Moors. On James'' death, the lands of the Crown of Aragon were divided, with Aragon and Valencia, along with the Catalan counties, going to the eldest son, Peter, while the Balearic Islands (constituted as the Kingdom of Majorca), alongside the territories in the Languedoc, went to the second son, James.