An English brave person. Okay, there are probably other kanji meanings that aren't as common being put into effect here, but if you just think about this as King Arthur, an English brave person, then you can get the meaning of this word. King Arthur is probably England's most well known hero.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
This phrase is quoted from a book about heroes.