Essex's political ambitions begin to clash with his devotion and loyalty to Elizabeth. As Elizabeth finds her young lover's behavior becoming increasingly worrisome, she draws closer to Cecil, who is named Secretary of State following the death of Walsingham. Essex is publicly hailed upon his return to England after taking Cadiz from the Spanish, but his relationship with Elizabeth begins to deteriorate. She and Cecil suspect Essex of secretly communicating with James VI of Scotland, son of Mary, Queen of Scots, a potential successor to the English throne. After Burghley's death, Elizabeth sends Essex to Ireland to put down a rebellion but he instead makes a truce and returns to England alone. Elizabeth puts Essex under house arrest.