Muhammad bin Ishaq said: "Among the Muslims who were martyred on the day of al-Ta'if, then from Quraysh, then from Banu Umayyah bin Abd Shams, was Sa'id bin Sa'id bin al-As (may Allah be pleased with him)."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5515