It is believed that Ari later became a Christian priest in Staður by Ölduhryggur, now known as Staðastaður, but otherwise little is known about his life, despite the fact that he is one of the very few medieval writers who wrote down his family history.
Det antages at Ari senere blev en kristen præst i Staður ved Ölduhryggur, der i dag hedder Staðastaður, men ellers vides der ganske lidt om hans liv, udover at han er en af de meget få middelalderlige forfattere som har nedskrevet historie om sin egen familie.