|Don Carlos and Elizabeth|
|Real Names:|| Prince Don Carlos|
|Length of Relationship:||
|First appearance:||The Price|
Don Carlos sailed from Spain specifically to meet her royal highness Queen Elizabeth. He had written to her already, seeking an audience with the new Queen. Upon meeting her, he revealed though they were a good match politically, he wanted her as his bride because he was tired of waiting for his father, King Philip to die. He wanted to be a King. Elizabeth said he would consider his request. 
Days later, Elizabeth told him she was interested in his marriage proposal. However, a rumour had started circulating about her and Don Carlos requested she lift her skirt to prove her female status. Elizabeth refused, insulted at his bold and very rude accusation and sent him on his way. 
Don Carlos left for Austria, and eventually made his way to France.
Don Carlos: Your highness, you are a vision.
Queen Elizabeth: And you are a charmer I see.
Queen Elizabeth: What can Spain offer my country?
Don Carlos: How about all the gold and silver of the new world?
Don Carlos: Many Queens might meet my needs. But only you, meet my desires.
- Catherine's spied informed Mary Stuart that Don Carlos was looking for a Royal Wife. 
- Don Carlos is looking for a Queen to make his wife. He has entertained, Queen Elizabeth,  Archduchess Anna of Austria,  and Queen Mary. 
- Carlos, Prince of Asturias was the first son of King Philip and his first wife, Maria Manuela. He died at 23 years old, not long after a severe head injury that possibly caused him major head injuries.
|Three Queens, Two Tigers||Betrothed||Extreme Measures||The Price||In A Clearing||Fight or Flight||The Hound and the Hare||Our Undoing||Wedlock|
|Bruises That Lie||Succession||No Way Out||Strange Bedfellow||To The Death||Safe Passage||Clans||Intruders||Spiders In a Jar|