Ibn Taymiyyah’s writings were considered authoritative in and of themselves
Ibn Abideen (d. 1252 AH) was the most prominent Hanafi scholar in his time. He is nicknamed "Khatimat Al-Muhaqqiqen (The seal of the rigorous [scholars])".
His work Rad Al-Muhtar (AKA Hashiyat Ibn Abideen) is considered one of the Mu'tamad (definitive) Texts in Hanafi Fiqh today.
In this book we find him quoting Sheikh Al-Islam Ibn Taymiyyah (d. 728 AH) and documenting a Hanafi view based solely on Sheikh Al-Islam's word. Ibn Abideen says:
I saw in the book "Al-Sarim Al-Maslul" by Sheikh Al-Islam Ibn Taymiyyah Al-Hanbali the following: "As for Abu Hanifa and his companions, they said: (The Sheikh then stated the Hanafi view)..."
Ibn Abideen then said: His (Sheikh Al-Islam's) statement: 'Even if he converts to Islam after being captured,' I have not seen anyone from us (Hanafis) explicitly state this, but he transmitted it from our Madhab, and he is reliable, so it is accepted. (Hashiyat Ibn Abideen: 4/233).
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Inspired by this article
Ibn Abideen's original text can be found here
Of course, this isn't the usual way Muslim jurists document views, which is why I thought it was worth a post. And the title is supposed to be sarcastic, as scholars usually demand references when a claim is brought up.