There are two items with the name Ancient Remains:
Ancient Remains of Yort the Bronze
Yort the Bronze's Ancient Remains can be found in the northern part of Prophet's Path during the quest The Misplaced Sword. They mark the final resting place of Yort the Bronze and his Ceremonial Family Sword.
Ancient Remains of Sinni's Father
The Ancient Remains of Sinni's father can be found near Lieutenant Murunda in Zehlon Reach. They are guarded by the Lady of the Dead. His spirit can be freed during the quest A Father's Fate.