Goguryeo was the most powerful country in Korean history. Let's find out about how Goguryeo was established and fell. Goguryeo was established by Ju-mong. To be more exact, let me tell you about the foundation myth of  Goguryeo. Hae-mo-su,the heavenly King loved Yu-wha, the daughter of Ha-baek. But, Hae-mo-su left Yu-hwa. So instead, King Geum-wa took care of Yu-wha. Later, Yu-hwa gave birth to an egg. King Geum-wa thought it was an-egg from another man,so he threw it away. Animals took care of that egg. The egg hatched and a boy was born. His name was Ju-mong, because he was very good at archery. Princes of Geum-wa was jealous of Ju-mong, because that thought King Geum-wa loved Ju-mong more than them. So, they decided to kill him. But, Ju-mong noticed the plan to kill him. So,he ran away. When he got to the other side of the river and was safe, he established Goguryeo. At first, Goguryeo seemed like powerful country. Like Golden Age King Gwang-gae-to 'The Great' and King Jang-su brought. Not until the war Sui started. They wanted Goguryeo to respect them and wanted to have Goguryeo's wide land. But when Goguryeo refused,they attacked Goguryeo several times. To be exact, four times. Goguryeo won all the battles. The second battle;s victory was one of the most famouse victory, and was called,'The Great Victory at Salsu river'. By this war, Sui was weakned. Later, Tang attacked Sui and won and occupied Sui's land. They attacked Goguryeo too. But Goguryeo defeated Tang like Sui. These wars proved that Goguryeo was the strongest country in East Asia. But due to these wars, Goguryeo beecame weaker and weaker. Then, Goguryeo dissapeared from history. But it's still in its descendants' minds, us.