In 1314 King James II of Aragon ordered him to make a Latin adaptation of a now-lost autobiography of James I of Aragon, the Llibre dels feyts.
The Catalan language original famously recounted the heroics of James I, known as the "Conqueror," and was a project in which the King himself had reputedly been involved.
Marsili completed the four-part work in 1322 and titled it Commentarioum de gestis Regis Jacobi primi or Commentary on the Deeds of King James I (at times called the Liber gestorum or Book of Deeds, in reference to the original).
Some historians believe he may also have written other extant works traditionally ascribed to a Pere Martell.
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