Question: Ibn al-Sal'us was the chief financial adviser for the sultanate that spanned which realm?
Sentence (from "Mamluk Sultanate (Cairo)"): The Mamluk Sultanate (Arabic: سلطنة المماليك‎ ‎ "Salṭanat al-Mamālīk") was a medieval realm spanning Egypt, the Levant, and Hejaz.
Relevant evidence: Yes