Mehmed IV (Turkish: IV. Mehmed; 2 January 1642 – 6 January 1693) was the Sultan of the Ottoman Empire from 1648 to 1687. He came to the throne at the age of six after his father was overthrown in a coup. Mehmed went on to become the second longest reigning sultan in Ottoman history. While the first and last years of his reign were characterized by military defeat and political instability, during his middle years he oversaw the revival of the empire's fortunes associated with the Köprülü era. Mehmed IV was known by contemporaries as a particularly pious ruler, and was referred to as gazi, or "holy warrior" for his role in the many conquests carried out during his long reign. Under his reign the empire reached the height of its territorial expansion in Europe. From a young age he developed a keen interest in hunting, for which he is known as avcı (translated as "the Hunter"). In 1687 Mehmed was overthrown by soldiers disenchanted by the course of the ongoing War of the Holy League. He subsequently retired to Edirne, where he resided until his natural death in 1693. Born at Topkapı Palace, Constantinople, in 1642, Mehmed was the son of Sultan Ibrahim and Turhan Hatice Sultan. Mehmed's reign is notable for a revival of Ottoman fortunes led by the Grand Vizier Köprülü Mehmed and his son Fazıl Ahmed. They regained the Aegean islands from Venice, and Crete, during the Cretan War (1645–1669). They also fought successful campaigns against Transylvania (1660) and Poland (1670–1674).

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