Ubay ibn Qays al-Nakha'i is the third figure said to be interred in the Uwais al-Qarni complex in Raqqa alongside Ammar ibn Yasir and Uways al-Qarani, associated with the Battle of Siffin (37/657) era. Detailed biographical information is limited; he is known chiefly through the shrine record. The complex was destroyed by ISIS in 2013-2014 and not rebuilt. (Sources: Wikipedia 'Uwais al-Qarni Mosque'; syrian-treasures.com.)