Count Doyle met his demise at the hands of Count Selius by the order of Count Lazarus.
The nights before, after the council meeting and after Darian reported to Count Doyle, At Ermanno quarter, he already informs Count Lazarus of his suspicion with Count Doyle, at first Count Lazarus didn't believe Ermanno and threatened to punish him for making story behind his brother, but Ermanno gave him compelling reason and told Count Lazarus made a hint of his suspicion when he was called by him the first night they arrived at his own quarters.