Ajagae was a military and rebel leader in the Sangju area during the waning years of Unified Silla who led a local rebellion which seized Sangju and is remembered primarily as the father of Kyà Ân Hwà Ân, the founder and first king of Later Baekje. Some Kyà Ân family lineages therefore claim him as their progenitor, although he was surnamed Yi. Ajagae was born and lived most of his life in Gaeun, in modern-day Mungyeong, where he was a farmer. According to the historical text Samguk yusa, he was descended from King Jinheung of Silla, but clearly his branch of the family had lost its royal connection some time before.
Since there is no record of interactions between Ajagae and Kyà Ân Hwà Ân during their later years, it is possible that Ajagae was not really Kyà Ân Hwà Ân's father. The records of the Later Three Kingdoms period, however, are too sparse to permit any conclusive judgment. It is equally possible that the two men became estranged after Kyà Ân Hwà Ân left home to join the Silla army.