TMZ knows who triggered the fight that left Rihanna battered and bruised and Chris Brown an accused felon -- it's Brown's manager.
Sources tell us the woman who left the three-page text message on Brown's cell phone is Tina Davis. <span style="font-weight: bold">Davis -- who turns 40 this month -- was rumored to have had a relationship with Brown when he was 16. </span>Brown and Davis have denied it.
Law enforcement tells us the text message to Brown talked about hooking up later -- and it totally [censored] off Rihanna. <span style="font-style: italic">She slapped and hit him </span> <span style="font-weight: bold">and he then </span>brutally fired back.
<span style="font-weight: bold">The detective's affidavit refers to the text message as being "from a woman who Brown had a previous sexual relationship with."</span>
Davis could not be reached for comment.

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