Go to www.wikipedia.com to look up the names of any royal or noble figure by using its search engine.

For example, type in "Charles I" or "Charles II" or any name with Roman numeric and the search engine will give you a list of royal/noble figures based on Charles.

Pay very close attention whose parents or relations each royal or noble figure is related to. It's very easy to get lost or confused with the names, so pay very close attention to these figures' names. A lot of links by clicking on the names.

I've been putting a lot of Wikipedia URLs in the comment parts of every royal/noble figure in my GEDCOM under Ancestry.com so for current and future members to look up the comment section and copy-paste the URL link to a webpage to take them to see who's who on Wikipedia's royal/noble figures.