The Three Kingdoms of Korea - Goguryeo, Baekje, and Silla - dominated the Korean peninsula from the 1st to 7th centuries AD. Goguryeo was the largest and most advanced early kingdom located in northern Korea. Baekje occupied the southwest and had strong ties to Japan. Silla was based in the southeast and eventually allied with China to defeat the other two kingdoms by 668 AD, unifying the peninsula under Silla rule. These three kingdoms developed sophisticated cultures and advanced technologies while defending their territories from Chinese incursions.