Cyrus is the second son of the previous King and Queen of England and the younger brother of Simon Henstridge. Cyrus married and later divorced Veruca Popplewell, Duchess of Essex, who gave him two daughters, Penelope and Maribel. Cyrus has always wanted to be King - a role his older brother assumed after the death of their father. Cyrus is very power hungry aligning himself with Queen Helena to get that power. He is the polar opposite of his older brother Simon. He wants to be the next on the throne.
Season 1
It starts out with Robert's funeral and we see Eleanor accusing Cyrus of being happy that Robert is dead which means there are more people in line for the throne. We see Cyrus checking out the maid, Prudence while the whole family dines together. Later on, Cyrus came onto Prudence, which she rebuffed, but he threatens her job if she does not perform sexual acts on him.
Quotes
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You're one breath away from the greatest throne on earth, and you're squandering it on school boy crushes and pints of beer in a pub.