Gui also compiled the "Chronique des rois de France" in 1313"," an illustrated genealogy of the kings of France. This included the "Arbor genealogiae regum francorum," one of the earliest known examples of a family tree, which was widely reproduced. He also contributed his literary energies to the campaign for the canonisation of Thomas Aquinas, producing the hagiography "Vita Sancti Thomae Aquinatis" (based largely on extant works by William of Tocco) in 1318 and a catalogue of his works in 1320. He probably attended the canonisation ceremony in Avignon in July 1323.