Fulk IV, better known as Fulk le Réchin, was the count of Anjou from around 1068 until his death. He was noted to be "a man with many reprehensible, even scandalous, habits" by Orderic Vitalis, who particularly objected to his many women and his influential footwear, claiming he popularized the pigaches that eventually became the poulaine, the medieval long-toed shoe.

The count of Anjou was the ruler of the County of Anjou, first granted by Charles the Bald in the 9th century to Robert the Strong. Ingelger and his son, Fulk the Red, were viscounts until Fulk assumed the title of count. The Robertians and the Capetian kings were distracted by wars with the Vikings and other concerns and were unable to recover the county until the reign of Philip II Augustus, more than 270 years later.