This book is based on the Apicius cookbook but has been supplemented with modern times vegan recipes, harking back to the ingredients and recipes of the old days. Apicius is a collection of Roman cookery recipes, thought to have been compiled in the 1st century AD and written in a language in many ways closer to Vulgar than to Classical Latin; later recipes using Vulgar Latin (such as ficatum, bullire) were added to earlier recipes using Classical Latin (such as iecur, fervere). Based on textual analysis, the food scholar Bruno Laurioux believes that the surviving version only dates from the fifth century (that is, the end of the Roman Empire): "The history of De Re Coquinaria indeed belongs then to the Middle Ages". The name "Apicius" is taken from the habits of an early bearer of the name, Marcus Gavius Apicius, a Roman gourmet who lived sometime in the 1st century AD during the reign of Tiberius. He is sometimes erroneously asserted to be the author of the book pseudepigraphically attributed to him. Apicius is a text to be used in the kitchen. In the earliest printed editions, it was usually called De re coquinaria (On the Subject of Cooking), and attributed to an otherwise unknown Caelius Apicius, an invention based on the fact that one of the two manuscripts is headed with the words "API CAE" or rather because a few recipes are attributed to Apicius in the text: Patinam Apicianam sic facies (IV, 14) Ofellas Apicianas (VII, 2). It is also known as De re culinaria.