As you might be knowing, Sayana is one of the classical commentator on Vedas. My question is what was his opinion on the authority of Ithihas and Puranas? Did he believe in them?
Sayanacharya often alludes to Puranic legends to explain certain Vedic Mantras. This I have noticed at some places of the YajurVeda books I have.
In the book Rig Veda Mandala 5 (R.L.Kashyap) the author/translator also confirms the same.
The author says in his foreword (p.26):
Unlike Sayana Acharya, we do not resort to Puranic legends to explain the mantra-s.
So, Sayana Acharya did had belief in the Puranas.