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Ibn Taymiyya wrote a letter to a crusader king in Cyprus who took Muslims as captives.
Ibn Taymiyah said:
ثم عند المسلمين من الرجال الفداوية الذين يغتالون الملوك في فرشها وعلى أفراسها : من قد بلغ الملك خبرهم ; قديما وحديثا .
Muslims have Fidayeen who can take the Kings from their throne or kill them secretly…
He also mentioned that Muslims always do good to Christian captives and we want same in return, he also spoke against trinity and asked him to accept Islam.
الرسالة القبرصية by Ibn Taymiyyah