Adamanta was born in around the twenty-ninth century of the Third Age. She was the wife of Gerontius Took. Adamanta and Gerontius had a big family and Adamanta was the mother of Isengrim III Took, Hildigard Took, Isumbras IV Took, Hildigrim Took, Isembold Took, Hildilfons Took, Isembard Took, Hildibrand Took, Belladonna (Took) Baggins, Donnamira (Boffin) Took, Mirabella (Took) Brandybuck and Isengar Took.
- The Lord of the Rings: Appendix C, "Took of Great Smials" pg. 1103
- The Complete Guide to Middle-earth