The De Divinatione belongs to the several philosophical treatises Cicero (106-43 B.C.) composed at the end of his life, in the years 45 and 44 B.C. The particular treatise for its most part was written before Caesar’s death (15 March 44), at the end of 45 and the beginning of 44. After the Ides of March Cicero added a few passages and wrote the prooemium to the second book (Durand, 1903; Guillaumont, 2006, 26-33). Thus the De Divinatione was composed between the De Natura Deorum (On the Nature of the Gods, autumn 45) and the De Fato (On Fate, May-June 44). These three works together comprise a single unit: the question of divination is intimately …
GUILLAUMONT, François. "De divinatione". The Literary Encyclopedia. First published 15 March 2014; last revised 30 November -1.
[http://www.litencyc.com/php/sworks.php?rec=true&UID=13346, accessed 27 April 2015.]