Mavrozomis was adopted by Ioannis Komnenos, making him part of the Royal Family. That means that his sons, adopted or not should be considered part of the Royal Family. The title of Caesar worn by Methodios Tagaris is testimony to this.
Furthermore closer reading of the records will reveal to you that it was in fact Methodios Tagaris that declared war on the Basileus through his act of treason, every loyal subject of the Basileus should respond with a declaration of their own to this blatant attack.
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