Source: TrentC 88, fols. 304v-311r (c.1460-62). From a stylistic point of view this Mass is unquestionably English. De Lisle was a common name in medieval England, and it was routinely rendered De Insula in Latin texts. Unclear what type of mass this is (paraphrase, cantus firmus, etc.). Dating from Wegman. Kyrie missing. No model in Wegman. Agnus dei is fragmentary.