Mr Josh in Westeros

We couldn't tell the story of Josh York for seven days and seven nights. Some people say that he is the most powerful swordsman among the Seven Kingdoms and even the Free Cities. His sword can cut off the head of a demonic dragon and can also separate a girl's hair. Some people say that he is a descendant of ancient wizards, possesses the secrets sealed in ashes, and can easily move the thunder clouds in the sky and separate the land from the sea. Some people say that he is a born singer, mastering the most beautiful melodies in the world. When he plays the six-stringed harp in his hand, even the Seven Gods will stop. Some say he is... So who is Mr. Joshi? Hey, have you ever heard of the conjunction of the celestial sphere?