Proclus regarded him with the greatest veneration, and gave directions that at his death he should be buried in the same tomb with Themistius.
Theodorus Meliteniota, in his Prooemium in Astronomiam, mentions commentaries on the Magna Syntaxis of Ptolemy by the philosopher Syrianus.
He is important in expanding the details of the Neoplatonist metaphysical system begun by Iamblichus and most completely delineated by Proclus.
In explaining the propositions of Aristotle, he appends the views held by the Neoplatonist school on the subject in hand, and endeavours to establish the latter against the former.
Syrianus attributes the existence of evil to otherness and plurality, which he believes the dyad is directly responsible for creating.