Imam Sajjad in Yazid's court

Re: Imam Sajjad in Yazid’s court

How come people of Syria were not aware of Ahl e Bait? They might have not known Hazrat Zain ul Aabdeen (RA) by face, but they were well aware of Hazrat Hasan and Hussain. Tibri mentions that during Hazrat Muawiya’s period both the brothers used to visit Syria and Hazrat Muawiya send them gifts