Jon snow is an actor in the America television series called Game of throne. He played the Ned stark bastard until the truth behind his birth was revealed.
Jon Snow was half Targaryen and half Stark, his father was Targaryen and his mother, Lynn was the younger sister to Ned stark. On her death bed she made Ned make a promise never to reveal Jon’s birth secrets as if he was known to be a Targaryen he will be killed.
Jon snow was one of the heroes of the movies he fought with the wildings. He fought with the white walkers.
He also fought the battle of the bastards and other battles. He was king in the north and also commander of the night watch.
In the beginning of the book and the HBO series Game of Thrones, Jon Snow was said to be Eddard “Ned” Stark’s bastard son. However, if you read the books, you will have an idea that Ned was keeping a very important secret because he kept remembering Lyanna’s last words which were: “Promise me, Ned.”
It was only in the finale episode of the seventh season did Bran Stark reveal that Jon Snow was in fact a Targaryen because he was the son of Rhaegar Targaryen and Lyanna Stark. They were in fact in love with each other and secretly got married. Ned Stark only told everyone that Jon Snow was his bastard son because Lyanna asked him to protect Jon from King Robert’s wrath.