What is the name of ravana's grandmother?

Ravana's grandmother is named "Kaikesi." She is a significant character in the Hindu epic Ramayana, as she is the mother of Ravana's father, Vishrava, and is a demoness from the lineage of the Asuras. Kaikesi is known for her beauty and intelligence, and her marriage to the sage Vishrava produced several notable offspring, including Ravana and his brothers.