Answer
Damascus was the destination of Ali al-Sajjad following the Battle of Karbala. After the tragic battle, he was captured along with other survivors and taken to the Umayyad capital. There, he was subjected to imprisonment and interrogation by the ruling caliph, Yazid I. Ali al-Sajjad's resilience and unwavering faith during this ordeal earned him the title "Zayn al-Abidin" (Ornament of the Worshippers).