By the 6th century AD, Gaya could not risk the hostility of either Baekje or Silla (two of the Three Kingdoms of Korea that dominated the peninsula, the third being Goguryeo). Ara Gaya put a great deal of effort into pursuing a diplomatic solution for maintaining its independence, including hosting summits between Baekje, Silla and Yamato-Wa.
The Gaya confederacy was greatly weakened at the time, as northwestern Gaya states fell under the influence of Baekje and southeastern states fell under Silla's influence. Ara Gaya sought to maintain its independence by allying itself with Goguryeo, and then asked Goguryeo to invade Baekje in 548 AD. This attempt to weaken Baekje's sphere of influence failed when Goguryeo failed to succeed in the campaign.
In 553 AD, Silla defeated Baekje in war and occupied the Gyeonggi area (the Han River basin), breaking its 120-year alliance with Baekje. Silla, having started incorporating the parts of Gaya already under its sphere of influence, also invaded the rest of Gaya to eliminate Baekje's sphere of influence there. Ara Gaya capitulated to Silla in 559 AD.