My family has a lot of royalty ancestors. How can I learn more about them?

Question

My family has a lot of royal people and I want to find out more about them. I'm only including ones I'm a direct descendant of.

Njord, King of Swedes

Yngvi, King of Turkey

William the Conquerer

Aubrey De Vere (Justiciar of England)

Rollo Ragnvaldsson

Henry I "Beauclerc" of Normandy

Constance Le Gros, Princess of Brittany

Maud of Normandy

I may post more but I'm mainly interested in these. Also I want to learn more about Njord and his family. Thanks.

Answer 1

ancestry.com

Answer 2

Google the  names.

Answer 3

I suggest you search again,I had no trouble.