Jon Snow aka Aegon Targaryen is the son of Lyanna Stark and Rhaegar Targaryen. Jon Snow is the second most powerful character of Game of Thrones as seen in last season. Jon Snow has also transformed a lot during this series. He is now the Prince of Dragonstone
Check the stunning transformation of Jon Snow throughout 8 seasons.
Following is the photo of Jon Snow in the first season vs finale of Game of Thrones.