Fundin was born in the Lonely Mountain in the year TA 2753. He fathered two sons, Bálin & Dwálin, both of which were members of Thórin & Company and were involved with the regaining of Lonely Mountain. In the year TA 2880, Fundin was 218 years old at the time when King Thrór found the Arkenstone and named it the "King's Jewel". Fundin was worried about the sickness and warned both his sons on what it would do. This was time when Smaug invaded the mountain and Fundin, along with his sons, went into exile with all the dwarven people of Erebor after the attack.