According to legend, Gojoseon was established in 2333 BC by Dangun, the prince of the gods. In 109 B.C., Han China invaded Gojoseon due to a conflict regarding escourts. However, the two pronged attack was poorly coordinated, as that both fronts had their independent command, and soon fell apart. In 108 B.C., however, the command was merged and Wanggeom was besieged, and later Gojoseon became a vassal state to Han China. Han China proceded to impose the Four Commanderies of Han. Later, Gojoseon fractured and broke into several kingdoms, including Buyeo, Okjeo, Dongye, Goguryeo, and Baekje.