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In page Malhun Hatun:

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The 1324 endowment deed for a Dervish Monastery built by Sultan Orhan suggests that his mother was not, as popular historical tradition maintains, Edebali's daughter but rather Mal Hatun, the daughter of one "Umar Bey or Ömer Bey". The title "Bey", used by the princely dynasties of Anatolia, suggests that Mal Hatun's father was a person of some status and authority. One possibility is that he was the eponymous ruler of an "Amouri" (Umeri) Principality, which was located northeast of the emerging Ottoman State and disappeared in the late 13th or the early 14th century.[citation needed]