Background

He was the son of Buyeo Gonji, the younger brother of the 22nd king Munju who returned to Baekje from Yamato Japan in 477 after hearing of the fall of the Baekje capital. Gonji died in that year, and like Munju may have been murdered by Hae Gu. Dongseong appears to have been promoted to the throne by the Jin clan that prevailed over Hae Gu's rebellion. After Samgeun died without children, the throne passed to Dongseong.

Reign

He worked to strengthen the court's power after the move of the capital from the present-day Seoul area to Ungjin. He built several fortresses and castles to build out the new capital. He incorporated the local Sa, Yeon, and Baek clans into the court to counter the entrenched aristocracy from the former capital.

Dongseong sent a tribute mission to the Southern Qi in 484, reopening Baekje』s ties with southern China after a long hiatus.

He established an alliance with Silla through his marriage of a Silla noblewoman in 493, and the two countries united in attacking Goguryeo in 495.

In 498, the Baekje army subjugated Tamna, the kingdom on Jeju island which had formally accepted Baekje rule twenty-two years before, because it failed to send tributes.

The Book of Qi states that Dongseong sent armies to Liaodong and Liaoxi (요서 辽西) in China to defeat Goguryeo forces.

Death

Beginning in 499, the country was stricken by famine, but according to the Samguk Sagi the king was unresponsive. He continued to live an indulgent lifestyle while brigandage spread.

By the end of Dongseong's rule, the local clans of the new capital had eclipsed the traditionally powerful Hae and Jin clans, and even pressured the throne. Dongseong sought to contain them by exiling Baek Ga to an outlying castle. This caused great resentment, and Baek Ga's forces assassinated Dongseong while he was hunting.

Family

• Father: Buyeo Gonji (son of the 21st King, Gaero of Baekje)

• Mother: unknown (possibly a Japanese woman)

　　• Queen: unknown

　　　• Son: Buyeo Sama/Buyeo Yung (扶馀斯摩/扶馀隆, 462–523) – 25th King of Baekje, Muryeong of Baekje

　　• Concubine: unknown – from the Jin clan

　　• Concubine: unknown – from Lee clan of Silla (伊飡 比智女를), married 493

　　　• Daughter: Princess Bogwa (보과공주, 宝果公主) – consort of the 23rd King of Silla, Beopheung of Silla.

背景

东城王是盖卤王弟昆支的长子，昆支客居日本多年，公元477年，听闻高句丽长寿王于475年攻破百济首都汉山城，杀百济盖卤王，并吞汉江流域。百济首都慰礼城被高句丽攻陷。盖卤王出奔后在阿且城（今首尔特别市城东区康壮洞）被杀死。昆支于公元公元477离世。解仇于477年9月暗杀文周王。两年后，文周王子三斤王无子嗣离世后，权臣解氏和真氏家族从日本拥立东城王回百济即位。

从此以后，百济王权旁落，直至武宁王即位后王权才得以恢复。

东城王的统治

百济首都慰礼城(今天首尔附近)被高句丽攻陷，东城王迁都去了熊津。他在新首都的北部建造了几个要塞和城堡来抵挡来自北方的威胁。他拉拢新都当地萨，铅，和白部族到政府中以平衡新旧势力。

东城王于484年派遣使节去南齐朝贡，使得长期中断的中韩外交关系得以继续。百济使节在齐国介绍本国情况的时候曾经夸大为「略有辽西」，使得齐国的史书中由此记载为百济在辽西有编制晋平郡晋平县，而这很有可能是对于百济旧都晋朝时期的平壤县（大同江西）的讹传所致。

公元493年，东城王通过和亲与半岛东部的新罗国建立了联盟，一同对抗北方的强敌高句丽。

在498年，百济军队征服耽罗王国（今天的济州道，济州岛）。

东城王的离世

从499年开始，百济国遭受著极大的饥荒，但据三国史记记载，东城王继续放纵的生活方式，而使得国力衰弱，盗匪蔓延。

东城王统治的晚期，当地的部族已超过了传统和强大的旧贵族部族（解氏和真氏家族），王族的统治收到了更大的压力。他们对于东城王的不满，使得国王在打猎中被卫士佐平苩加的势力暗杀。

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