James I the Conqueror was King of Aragon, Count of Barcelona, and Lord of Montpellier from 1213 to 1276; King of Majorca from 1231 to 1276; and Valencia from 1238 to 1276.

His long reign—the longest of any Iberian monarch—saw the expansion of the Crown of Aragon in three directions: Languedoc to the north, the Balearic Islands to the southeast, and Valencia to the south.

As a legislator and organiser, he occupies a high place among the European kings. James compiled the Llibre del Consolat de Mar, which governed maritime trade and helped establish Aragonese supremacy in the western Mediterranean. He was an important figure in the development of the Catalan language, sponsoring Catalan literature and writing a quasi-autobiographical chronicle of his reign: the Llibre dels fets.

His Obolo or Dinero coin depicts the bust on its obverse face. The reverse of a coin depicts the Patriarchal cross.

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