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{{QuoteBox

|quote = '''''"You are all variously loyal to me, intelligent, reliable, trustworthy and divorced from the weakness of [[human]] compassion. The Legion needs leadership. It needs us."'''''

|source=—''Jago Sevatarion'', when forming the third iteration of the Kyroptera{{Fn|1b}}

}}

The '''Kyroptera''' was an informal council of [[captains]] of the [[Night Lords]] [[Space Marine Legion|Legion]] during the [[Horus Heresy]]. It existed at least as far back as the [[Great Crusade]]{{Fn|3}} but its subsequent reorganisation and the actions of its members would go on to have an effect on the style of the legion's operations during and after the [[Horus Heresy]].{{Fn|1a}}