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call upon you to seize him

要求/召集你們逮捕他

`call upon someone to do something` 意思是「正式地要求或召集某人做某事」。凱特琳在這裡是在公開尋求幫助，要求大家合力逮捕提利昂。

In the name of King Robert and the good Lords you serve,

I call upon you to seize him and help me return him to Winterfell

to await the King's justice.