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I was reading the definition of 庇う:
（１）他からの危険や非難などが及ばないように守る。「部下を―・う」「傷を―・う」「君を―・ひ参らせんとて，現在の主を打ち奉るぞ/義経記 7」
In the example sentence: 君を―・ひ参らせんとて，現在の主を打ち奉るぞ/義経記 7 there is a "参らせんとて". I'm assuming it's an old form because it is quoted from 義経記. From what I can see, 参らせんとて comes from the causative of 参る + とて?
What is this とて and is 参らせん any different from modern causative of 参る?
まいらす (まゐらす in historical kana) is an old subsidiary verb that forms a humble expression. It corresponds to お～する or ～申し上げる in modern Japanese. It was originally the causative form of 参る, but it lost its causative meaning just as other subsidiary verbs did. (By the way, this is the direct ancestor of modern ます, the politeness marker.)
まいらせん is まいらす in irrealis form (未然形), followed by ん/む, an archaic volitional auxiliary. とて is と思って in modern Japanese. 君 was a highly honorific word in those days (see this).
So 君を庇ひ参らせんとて is あなた(様)をお守り申し上げようと思って in modern Japanese, or "thinking I will guard you".
