Hi OP and potential respondents. Just a reminder of this subreddit's privacy policy:

Certain questions can lead to privacy concerns, and with this in mind, there are specific inquiries that we prohibit where, in our estimation, possible privacy concerns override the historical value of the question. As such, we do not allow questions which pose possible privacy issues for living, or recently deceased, persons who are not in the public eye. The cut-off for "recent" is 100 years, but even if a question does not meet the exact criteria above, we may remove at moderator discretion if we believe there nevertheless remains certain privacy concerns.

So with that in mind: it's fine to discuss descendants of Henry IV who were either (a) born >100 years ago or (b) are public figures. Otherwise, do not post personal information about regular living, or recently deceased, people.

Also, OP, you might consider x-posting to /r/genealogy: someone may be able to direct you to a descendant tree.