St. Thomas's greatest work was the "Summa", and it is the fullest presentation of his views. He worked on it from the time of Clement IV (after 1265) until the end of his life. When he died, he had reached Question 90 of Part III (on the subject of penance). What was lacking was added afterwards from the fourth book of his commentary on the "Sentences" of Peter Lombard as a "supplementum", which is not found in manuscripts of the 13th and 14th centuries. The "Summa" was translated into: the Indo-European language of Greek (apparently by Maximus Planudes around 1327) and Armenian; many European languages; and Chinese.