Isumbras was the third child of Gerontius Took and Adamanta Chubb. He came from a large family of eleven other brothers and sisters: Isengrim, Hildigard, Hildigrim, Hildifons, Isembard, Hildibrand, Belladonna, Donnamira, Mirabella, and Isengar. He was the father of Fortinbras Took and the grandfather of Ferumbras Took. As Thain, he ruled from TA 2930 to his death in TA 2939.
|Thain of the Shire|
Isengrim III Took
|Isumbras IV Took||Succeeded by|
Fortinbras II Took
|TA 2930 - TA 2939|