The Ottoman Army in Transition: Lessons from Seventeenth-Century Cavalry Salary Registers Taking the Empire by Force: The Ottoman Household Cavalry’s “Usurpation” of Tax Collection in the Early Seventeenth Century The Career of Customs Officer Hasan Agha as a Financier for the Ottoman State (1646–56) “Nothing Can Be Acquired Without Money”: The Purchase of Office and “Backroom” Tax Farming in the Early Modern Ottoman Empire