Mandodaree was the daughter of Maya Daanav (from an Apsaraa) and wife of Raavan. Once Maya Daanav met Raavan. He asked his introduction. Raavan told him that he was the grandson of Pulastya Muni. Considering him from a noble family he married his daughter Mandodaree to him. She had two brothers - Maayaavee and Dundubhee. Both were killed by Baali (Sugreev's brother). She  had a son named Meghnaad who was mightier than Raavan.

She was a very good, logical, religious and a Satee woman. She is counted among five Satee women, such as Satee Draupadee, Satee Anusooyaa,  Satee Sulochanaa (Meghnaad's wife) etc. So she was not any inferior to any good woman even being a Raakshas' wife.

During the whole war period, according to Maanas, she had been advising like a good wife to Raavan to return Seetaa to Raam and not break out war with Him, but he didn't listen to her. At last she had to lose both her son and her husband in this war.

Maanas mentions Mandodaree facing Seetaa when Seetaa was sitting in Ashok Vaatikaa, and Hanumaan was hiding among leaves of a tree looking for a suitable opportunity to deliver Raam's message to Seetaa. Raavan came there along with Mandodaree and other women. When Raavan wanted to kill Seetaa, Mandodaree held his hand not to kill Her.

For another incident of Mandodaree and Seetaa see  "A Legend about Seetaa"