Simplify the following text for a Grade 7 native English-speaking person.
Original: Jumong is often said to be the Korean transcription of the hanja as æ è ' ( Jumong , ì # 1\/4 ë 1\/2 ) , é ' ç ( Chumo , ì '' ë ) , or ä '' ç ( Jungmo , ì ` ë ) .
Simplified: Goguryeo is a dynasty of ancient Korea which was begun by Jumong ( ì # 1\/4 ë 1\/2 æ è ' ) in 37 BC .