Judging from the reports in the Samguk sagi, Adalla's reign was a time of considerable expansion.

Tensions increased with the rival Korean kingdom Baekje for harboring a Silla traitor.

In AD 157, According to the Samguk yusa, This is the time when the legends of Yeono and Seo(延烏郎細烏女說話) occurred.

In other words, the Itsuhiko, which was established in this area after crossing from Iseoguk(present-day Cheongdo) of Silla, confronted the forces of Yamato, Hokuriku(北陸) and Setona Ikai(瀬戸內海), and formed an alliance with Silla.

Adalla's tomb is believed to lie next to those of two later kings of Bak Hyeokgeose's line, in the Samneung complex near Namsan in central Gyeongju.