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According to Wikipedia

According to Orderic Vitalis, Bertrade was anxious that one of her sons succeed Philip, and sent a letter to King Henry I of England asking him to arrest her stepson Louis.
Orderic also claims she sought to kill Louis first through the arts of sorcery, and then through poison.

https://en.wikipedia.org/wiki/Bertrade_de_Montfort

What if Philip of Mantes survives in 1123 and marries Empress Matilda and becomes the rival of Stephen would this strengthen or weaken the position of Stephen of Blois?

Mantes is the uncle of Geoffrey the OTL husband of Matilda..
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