Abdizade Huseyin Husameddin and His History of Amasya: Trusted by Nobody, Cited by Everybody The Mastery of Occult Sciences as a Deterrent Weapon: The Representation of Vefk in the Halveti Circles at the Turn of the Sixteenth Century Re-Centering the Empire: The Forgotten Province of Amasya in the Formative Fifteenth Century Bayezid II, Müeyyedzade Brothers and the Transplantation of an Amasyan Network in Istanbul