In the University of Glasgow Library’s copy of Pius II’s Epistolae familiares (Nuremberg: Anton Koberger, 16 Sept. 1481), recorded on leaf 1–1v one can find a copy of a letter addressed to Pope Innocent VIII that starts with the heading “Soldanus pontifici Romano pro Restauracione Iunioris filii senioris Turchi”. The letter’s sender, who is referred to in the text as the “Sultan of Babylon”, was the Caliph of Cairo, al-Mutawakkil II (Abdul Aziz ibn Yaʿqub ibn Muhammad). The present text discusses the content of the letter and the issues regarding the question of its authorship. To ensure a comprehensive presentation of the argumentation, the paper not only discusses the content of the letter but also explores the wider context in which it was produced, situating it against the wider history of the Mamluk state and Mamluk diplomacy as well as the late medieval tradition of the exchange of correspondence (both real and fictitious) between the Christian and Muslim worlds. It needs underlining that not only has the content of the letter in question hitherto been substantially unknown to scholars, but the letter is furthermore the first discovered correspondent from an ʿAbbasid Caliph sent to the head of Western Christianity.

The paper offers a contribution to research on intercultural communication.

The paper comes with three appendices: a transliteration and a translation of the letter and a facsimile of the original record.

在格拉斯哥大学图书馆的庇护二世书信副本（纽伦堡：安东·科伯格，1481 年 9 月 16 日）中，记录在第 1-1v 页上，可以找到一封写给教皇英诺森八世的信的副本，该信的标题开头为“Soldanus pontifici Romano pro Restauracione Iunioris filii Senioris Turchi”。这封信的发件人在文中被称为“巴比伦苏丹”，是开罗哈里发穆塔瓦基勒二世（阿卜杜勒·阿齐兹·本·雅库布·本·穆罕默德）。本文讨论这封信的内容以及有关其作者的问题。为了确保全面地阐述论点，本文不仅讨论了这封信的内容，还探讨了这封信产生的更广泛背景，将其与马穆鲁克国家和马穆鲁克外交以及中世纪晚期的更广泛历史联系起来。基督教和穆斯林世界之间交换信件（真实的和虚构的）的传统。需要强调的是，迄今为止，学者们不仅对这封信的内容一无所知，而且这封信也是第一封被发现的来自阿拔斯王朝哈里发写给西方基督教领袖的信件。

该论文为跨文化传播研究做出了贡献。

该文件附有三个附录：信件的音译和翻译以及原始记录的传真。