  It deserves to be noted that before the 12th century, the whole Byzantine output of Aristotelian commentaries dealt exclusively with the works on logic. No doubt this reflects the needs of the educational sector at the time. Natural philosophy in the 7th–11th centuries is only represented by elementary compendia such as the ones by Symeon Seth (mid- to late-11th century). There is a commentary on the Physics attributed in some manuscripts (and in Benakis’ 2008 edition) to Michael Psellos, but recent research has plausibly suggested that this is really the work of the late-13th-century scholar George Pachymeres (Golitsis 2007).  If the range of subjects covered by the Aristotelian commentaries produced in the two decades after 1118 is much greater, this may be due to the initiative of the princess Anna Komnene, who seems to have commissioned a number of scholars to write commentaries on previously neglected works of Aristotle. This was an exceptional enterprise: it would and could hardly have been undertaken had it not been preceded by a period of strong interest in philosophy; but it left very few traces in the learned activities of the immediately following decades.