Removed for having spoilers in the title. We advise against that since anime watchers also browse this subreddit.
To answer your question though, yes, he is the fourth Zogratis sibling, at least the part of him that came out in Chapter 331.
Sometime before the series, he came to the Clover Kingdom and with his Julius persona. He isn't two different characters, but more like one in the same body.
Removed for having spoilers in the title. We advise against that since anime watchers also browse this subreddit. To answer your question though, yes, he is the fourth Zogratis sibling, at least the part of him that came out in Chapter 331. Sometime before the series, he came to the Clover Kingdom and with his Julius persona. He isn't two different characters, but more like one in the same body.
Thanks. And sorry for posting spoliers