I think it was mentioned in the last part of Ponniyin Selvan that oomai rani was under custody of Idumban Kari. When she saved the pandiya king they both were take care by him. The colour is not match with those but a chance is there. Thats why Nandhini trying to demolish Chozhas. I have to read it again and requesting you please do read the last chaper if you have the chance.